Recurring concern

Unreliable algorithmic triage of unwell patients

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First reported 31 May 2019•Latest report 3 Sep 2025

Definition

What this concern includes

Includes failures in algorithms or algorithm-governed triage processes used to assess unwell patients where the system inadequately accounts for reported symptoms or emergency indicators, fails to identify serious deterioration, provides insufficient direction for clinical escalation, or encourages unsafe reliance without appropriate clinical input.

Not included

  • Excludes failures in clinical assessment or treatment after the algorithm has appropriately identified the need for clinical input.
  • Excludes generic staffing, training, communication or service-capacity deficiencies unless they directly impair the algorithmic triage process.
  • Excludes named triage systems with a more specific established parent, such as NHS 111, MPDS, Manchester Triage System or ambulance call triage, when the assertion is confined to that system.
  • Excludes ordinary algorithm use where the algorithm reliably supports clinical judgement and no unsafe triage condition is identified.
Reports
7

Distinct published reports

Individual concerns
8

A report can raise multiple concerns

Date range
2019–2025

First to latest report issue date

Stated actions
8

Described in published responses

Reports over time

Reports over time

Reports about this concern issued each year.

* 2026 is projected from reports observed to 7 Sep 2026.

Most frequent recipients

Most frequent recipients

Reports about this concern sent to each recipient.

Department of Health and Social Care4
Barts Health NHS Trust1
Care Quality Commission1
East of England Ambulance Service NHS Trust1
NHS England1
North East Ambulance Service NHS Foundation Trust1
South Central Ambulance Service NHS Foundation Trust1
Welsh Ambulance Services NHS Trust1
Welsh Government1

Concerns and responses across reports

Only concerns grouped under this recurring concern are included. Select any concern, action or position to view the source wording.

  1. Manchester South

    AI-generated summary

    Margaret Bailey · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Margaret Bailey, who was bed-bound and wholly dependent on personal care, became unwell at home on 17 December 2023, later vomited while resting in bed, and was found unresponsive. The medical cause of death was aspiration of gastric contents following an episode of vomiting. Concerns included the absence of a triage algorithm for calls reporting that a client was unwell and the lack of equipment or ability to take basic observations, including a temperature reading.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Lack of an algorithm for office call handlers to triage clients who appear unwell and determine a course of action

    Wider context from the report

    “1. On the ‘office’ receiving a call from a carer reporting, as here, that a client appears to be unwell there is no algorithm for the call handler (who tends to be an assistant manager/manager but with no medical background) to follow to triage the client, setting out why the client appears unwell and to then determine a course of action. The direction of the conversation is simply left to the ‘office’. ”

    Source location

    Margaret Bailey · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Existing CQC regulation and reasonable initial guidance are considered sufficient; further action is not considered likely to prevent a similar incident.

    Verbatim wording from the response

    “The Care Quality Commission (CQC) requires all providers to have, at a minimum, baseline training and policies in place for staff to follow in the event a person in receipt of care experiences a deterioration in health or change in their condition or needs. This includes ensuring appropriate escalation channels are in place for staff to follow. Where a provider does use an algorithm to support the triage of phone calls, in instances such as these, CQC may review algorithms, alongside a provider’s general operating systems and day-to-day processes.”

    Source location

    Response from Department of Health and Social Care
    Page 2 · response
    Published 5 September 2025

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    The Department of Health and Social Care may be better placed to address concerns about call-handler triage algorithms.

    Verbatim wording from the response

    “We have given careful consideration to this point and note that this report has also been sent to the Secretary of State for Health and Social Care. The Department of Health and Social Care may be of greater assistance in addressing this aspect of your concerns because currently in line with CQC’s Scope of Registration the regulated activity of Personal care is defined as physical assistance given to a person in connection with:”

    Source location

    Response from Care Quality Commission
    Page 2 · response
    Published 5 September 2025

    Open published response
  2. Oxfordshire

    AI-generated summary

    Oscar Michael Thomas Keenan · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Oscar was born with a pelvi-ureteric junction obstruction and later developed a bacterial infection after prescribed antibiotics were not received. On 26 June 2024, he was taken to hospital after a call to NHS 111 about breathing difficulties, was found to have sepsis, and died the same day. Concerns included inadequacies in the algorithm for assessing ill newborns, reliance on the algorithm without early clinical input, and delay or lack of direction in obtaining clinical assessment.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Inadequacies of the algorithm in assessing ill newborns and infants and identifying significant respiratory problems

    Wider context from the report

    “[BRIEF SUMMARY OF MATTERS OF CONCERN] (1) The apparent inadequacies of the present algorithm in assessing ill newborns/infants, particularly in identifying significant respiratory problems that require early clinical assessment (2) Total reliance on the algorithm which does not appear to direct early clinical input. (3) A delay/lack of direction in obtaining clinical assessment. I have concerns that this is widespread and could occur in other areas. ”

    Source location

    Oscar Michael Thomas Keenan · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Total reliance on an algorithm that does not direct early clinical input

    Wider context from the report

    “[BRIEF SUMMARY OF MATTERS OF CONCERN] (1) The apparent inadequacies of the present algorithm in assessing ill newborns/infants, particularly in identifying significant respiratory problems that require early clinical assessment (2) Total reliance on the algorithm which does not appear to direct early clinical input. (3) A delay/lack of direction in obtaining clinical assessment. I have concerns that this is widespread and could occur in other areas. ”

    Source location

    Oscar Michael Thomas Keenan · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Continuously refine NHS Pathways using clinical feedback and real-world cases to improve infant and family safety.

    Verbatim wording from the response

    “We recognize that the remote assessment of very young babies is inherently challenging, and we continuously refine the system based on clinical feedback and real-world cases. In Oscar’s case – and in accordance with the investigation at SCAS - the review concluded that the algorithm functioned as intended, and no changes were required. However, every case contributes to our ongoing learning and improvement.”

    Source location

    Response from NHS England
    Page 3 · response
    Published 30 July 2025

    Open published response

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Log potential NHS Pathways system concerns with NHS England, including requests for information or change and anonymised patient-safety cases.

    Verbatim wording from the response

    “NHS Pathways System Issues”

    Source location

    Response from South Central Ambulance Service
    Page 8 · response
    Published 30 July 2025

    Open published response

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Hold monthly end-to-end 111 case-review meetings to identify learning and implement necessary process or system changes.

    Verbatim wording from the response

    “111 End to End Review Meetings”

    Source location

    Response from South Central Ambulance Service
    Page 8 · response
    Published 30 July 2025

    Open published response

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Administer monthly knowledge quizzes covering shared learning, procedure changes and NHS Pathways triage principles, with re-quizzing where results indicate insufficient understanding.

    Verbatim wording from the response

    “To further gauge understanding and comprehension of the content within any shared learning materials issued, there is a monthly Quick Quiz for both service lines (111 and 999) comprising of 10 true / false and / or multiple-choice questions. The questions are drawn from any recent Standard Operating Procedure (SOP) Change Notices, shared learning materials, existing SOPs, and general triage principles for the NHS Pathways system. The quiz is facilitated via MS Forms which allows staff who submit incorrect answers to see explanations of the correct answer with sign posting to the source reference materials. Quick Quizzes have included questions regarding assessing a patient’s breathing in July 2024, August 2024, September 2024 and April 2025 and regarding when and how to pass a call to a clinician every month since December 2024.”

    Source location

    Response from South Central Ambulance Service
    Page 3 · response
    Published 30 July 2025

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    The review concluded that the NHS Pathways algorithm functioned as intended in this case and required no changes.

    Verbatim wording from the response

    “We recognize that the remote assessment of very young babies is inherently challenging, and we continuously refine the system based on clinical feedback and real-world cases. In Oscar’s case – and in accordance with the investigation at SCAS - the review concluded that the algorithm functioned as intended, and no changes were required. However, every case contributes to our ongoing learning and improvement.”

    Source location

    Response from NHS England
    Page 3 · response
    Published 30 July 2025

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    NHS England, not the Trust, is responsible for altering the NHS Pathways algorithms.

    Verbatim wording from the response

    “As indicated at the beginning of this letter, the Trust is a user of the NHS Pathways system, and we are consequently not able to alter the algorithms contained within it, only NHS England can do this. We have therefore focused our review and response on the training that is provided to Emergency Call Takers and Health Advisors who use the NHS Pathways system and the process in place for identifying any themes or that indicate additional wider training may be required.”

    Source location

    Response from South Central Ambulance Service
    Page 2 · response
    Published 30 July 2025

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    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Local services manage the availability of services matched to the NHS Pathways recommended outcome.

    Verbatim wording from the response

    “Health advisors using the NHS Pathways system must have access to clinical support and supervision. They are trained to use probing questions to better understand caller responses. If a call is complex, uncertain, or includes three “not sure” answers, advisors are expected to seek clinical input. This support should be available immediately through a ‘warm transfer’ to a clinician, as required by the system’s Licence. To encourage this, NHS Pathways promotes the motto: “If in doubt, shout.” The system generates a recommended outcome (disposition), which is then matched to services commissioned locally. The availability of these services is managed locally.”

    Source location

    Response from NHS England
    Page 4 · response
    Published 30 July 2025

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    The Trust found no inherent or recurrent problem with staff failing to seek clinical advice when appropriate.

    Verbatim wording from the response

    “In addition to the above, our Clinical Coordination Centre (CCC) Quality Improvement Team have considered points 2 and 3 of the concerns raised and they are satisfied that there is not an inherent or recurrent issue of staff not seeking clinical advice when appropriate to do so within our call centres.”

    Source location

    Response from South Central Ambulance Service
    Page 2 · response
    Published 30 July 2025

    Open published response
  3. East London

    AI-generated summary

    Dave Yola Onawelo · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Dave Yola Onawelo, who had sickle cell anaemia, became unwell on 30 December 2023 and was later transferred to hospital after developing difficulty breathing. While waiting in the emergency department, he deteriorated, suffered seizures and a cardiac arrest, and resuscitation was discontinued at 19.48. The principal concerns were that he was not adequately identified as critically ill and that earlier fluid resuscitation, blood transfusion and intravenous antibiotics may have resulted in a non-fatal outcome; patient congestion, over-reliance on the NEWS algorithm, and a lack of compassion and clinical curiosity were also identified as contributing factors.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Over-reliance on the NEWS algorithm in clinical assessment

    Wider context from the report

    “A. The Trust failed to adequately identify a critically ill patient with a pre-existing co-morbidity, sickle cell anaemia, that carried with it a high risk of acute deterioration. Earlier introduction of fluid resuscitation, blood transfusion and i/v antibiotics is likely to have resulted in a non-fatal outcome. Factors in the emergency department including, patient congestion, over-reliance on the NEWS algorithm and a lack of compassion and clinical curiosity contributed to the outcome. ”

    Source location

    Dave Yola Onawelo · Prevention of Future Deaths report
    Page 3 · concerns

    Open source report
  4. Gwent

    AI-generated summary

    Dorothy Anne Jones · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Dorothy Anne Jones developed a chest infection and was assessed at home as needing immediate hospital admission. An ambulance did not attend until over nine hours after it was requested, and paramedics found that she had died. The report identified concerns about ambulance response times for Amber 1 patients, chronological allocation without further consideration of clinical need, and an ad hoc process for expediting responses.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Failure of the current ambulance triage algorithm to assign appropriate urgency to choking, breathing difficulty and drowsiness

    Wider context from the report

    “4. The evidence suggested that a patient who was choking, had difficulty breathing and was drowsy would still be assessed, under the current algorithm adopted by WAST, as meeting the requirement for an Amber 1 response. ”

    Source location

    Dorothy Anne Jones · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Regularly review Medical Priority Dispatch System code categorisation using clinical and operational data.

    Verbatim wording from the response

    “To ensure that the Welsh Ambulance Services NHS Trust (WAST) maintains a clinically safe response to patients, regular reviews are undertaken of current Medical Priority Dispatch System (MPDS) code categorisation by the Clinical Priority Assessment Software (CPAS) group.”

    Source location

    Response from Welsh Ambulance Services NHS Trust
    Page 2 · response
    Published 24 January 2023

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Operational concerns about ambulance service delivery are best addressed by the Welsh Ambulance Services Trust.

    Verbatim wording from the response

    “I note you have also written to ████████, Chief Executive of the Welsh Ambulance Services Trust and I would expect him to respond on the detail of the concerns you raised as these relate to operational matters and are best addressed by the Trust. I can, however, outline the actions being taken by the Welsh Government to drive national and local improvement in the delivery of safe and timely ambulance services.”

    Source location

    Response from Minster for Health and Social Services
    Page 1 · response
    Published 24 January 2023

    Open published response
  5. Manchester South

    AI-generated summary

    Keith Hopwood · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Keith Hopwood fainted and felt very unwell before calling an ambulance, reporting chest pain during a later call. He was found unresponsive at home and could not be resuscitated; the medical cause of death was myocardial infarction due to stenotic coronary artery atheroma. The concerns included delays and resource pressures in the ambulance service, failure to upgrade the call category, limitations in the call-handling algorithm, the use of a private ambulance not equipped to deal with a cardiac patient, and the handling of a disconnected call when he was alone.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Failure of the ambulance call algorithm to direct exploration of concerning symptom responses

    Wider context from the report

    “2. The inquest heard that in the initial call to the ambulance service he was told to call back if he got worse in any way. His response was to say that he couldn’t feel any worse than he had in the last 10 minutes. The algorithm driving the conversation did not direct that this response should require exploration of symptoms and why he had made this comment. As a consequence an opportunity to explore his presentation further was lost; ”

    Source location

    Keith Hopwood · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report
  6. Newcastle upon Tyne

    AI-generated summary

    Philip Richard Hayes · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Philip Richard Hayes suffered an aortic dissection on 14 April 2019 and died on 18 April 2019 after delays in ambulance response and diagnosis. The principal concerns included failure to reassess the emergency response despite five subsequent calls reporting additional symptoms and deterioration, inconsistent triage and referral for clinical input, and the appropriateness of algorithm-based triage.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Insufficient triage by algorithm when inadequate weight is given to reported symptoms and indicators of a medical emergency

    Wider context from the report

    “(6) Appropriateness of triage by algorithm. Insufficient if any weight given to actual reported symptoms and indicators of a medical emergency ”

    Source location

    Philip Richard Hayes · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report
  7. Norfolk

    AI-generated summary

    Christopher Williams · Prevention of Future Deaths report

    This summary was generated using AI from the published report. Please read the original report for the complete account.

    Report summary

    Christopher Williams underwent a procedure to remove an infected foot-surgery screw and later developed severe leg pain, bilateral paraesthesia, worsening back pain, and suspected cauda equina. There were delays in ambulance attendance and Emergency Department admission, and concerns about incorrect call triage, failure to escalate his worsening condition, and communication about an arranged admission bed. His condition deteriorated with sepsis, multi-organ failure and worsening heart failure, and he died on 26 January 2019.

    Read the report on judiciary.uk

    Source evidence

    How this individual concern was interpreted

    PFD Monitor created a concise, searchable interpretation from the report wording shown below.

    PFD Monitor interpretation

    Lack of a neurological-deficit triage algorithm

    Wider context from the report

    “(1) The amount of time taken for the ambulance to arrive which was markedly outside the Trust’s guidelines. (2) The failure by the call handler to both escalate Mr Williams worsening condition and her incorrect use of the haemorrhage algorithm. (3) When the ambulance transported Mr Williams to the NNUH he was kept on board the vehicle awaiting a space in the Emergency Department, despite a bed already arranged several hours before by the GP. This information was unknown to the crew and resulted in several hours delay in Mr Williams being investigated and treated which may have contributed to his death by sepsis. The Trust’s Business Continuity Manager was unaware until the inquest that the call handler had erred in failing to escalate and in using the wrong algorithm. He gave evidence that the Trust does not have an algorithm dealing with neurological deficit only a question asking if the patient is conscious. Given that Mr Williams had paraesthesia to both legs and the GP’s concerns about cauda equina this would seem to be a potentially dangerous gap in the Trust’s triaging system, placing patients at risk. In evidence the reasons given for the call handlers failure was that they did not know why she failed to escalate Mr Williams’ worsening condition and why she used the wrong algorithm and that the supplier of their IT software (the triage system), were reluctant to add a neurological algorithm, the reason for this is unclear. When asked the manager accepted that as the customer surely (the trust) could state that a neurological algorithm was necessary but merely that the supplier was reluctant. It is unknown why the paramedic crew were unaware of the arranged admission bed and the manager accepted in evidence that he had not made any enquiries about this, prior to inquest. Again, this failure in communication is one which I feel places other patients at risk of death and is unacceptable. This is not an isolated incident (death) and it appears that there are system failures within your organisation which should be addressed. ”

    Source location

    Christopher Williams · Prevention of Future Deaths report
    Page 2 · concerns

    Open source report

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Work with the IAED to improve triage standards and identify protocol gaps requiring clinical support.

    Verbatim wording from the response

    “Emergency Call Handlers work using a triage system called Medical Priority Dispatch Solution (MPDS). This system is designed and owned by the International Academy of Emergency Dispatch (IAED).”

    Source location

    2019-0183-Response-by-East-of-England-Ambulance-Service-NHS-Trust
    Page 1 · response
    Published 14 August 2019

    Open published response

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Meet the IAED, draft and submit a proposal for a neurological-deficit pathway in 999-call triage.

    Verbatim wording from the response

    “We work with the IAED to improve standards of triage and to also identify where a protocol does not meet the needs of patients, whilst also understanding that in an emergency environment where 999 calls are triaged by non-clinicians there will be some calls which will need clinical support/intervention in reviewing the response. The Trust’s Audit and Training Manager will be shortly meeting the IAED’s UK Manager, following which the Trust will draft and submit a Proposal for Change (PFC) to the Academy asking that they identify a neurological deficit pathway which could be used in the triage of 999 calls.”

    Source location

    2019-0183-Response-by-East-of-England-Ambulance-Service-NHS-Trust
    Page 1 · response
    Published 14 August 2019

    Open published response

    Source evidence

    How this respondent action was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    Send the neurological-deficit pathway proposal to NASMeD for consideration and support.

    Verbatim wording from the response

    “We work with the IAED to improve standards of triage and to also identify where a protocol does not meet the needs of patients, whilst also understanding that in an emergency environment where 999 calls are triaged by non-clinicians there will be some calls which will need clinical support/intervention in reviewing the response. The Trust’s Audit and Training Manager will be shortly meeting the IAED’s UK Manager, following which the Trust will draft and submit a Proposal for Change (PFC) to the Academy asking that they identify a neurological deficit pathway which could be used in the triage of 999 calls.”

    Source location

    2019-0183-Response-by-East-of-England-Ambulance-Service-NHS-Trust
    Page 1 · response
    Published 14 August 2019

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    The absence of a neurological-deficit protocol did not negatively affect the care provided or response assigned.

    Verbatim wording from the response

    “In the case of Mr Williams, whilst there was no protocol which addresses neurological deficit, this had no negative detriment to the care provided or the response assigned by the AOC as the highest level of response was achieved (Category 1).”

    Source location

    2019-0183-Response-by-East-of-England-Ambulance-Service-NHS-Trust
    Page 2 · response
    Published 14 August 2019

    Open published response

    Source evidence

    How this respondent position was interpreted

    PFD Monitor created a concise, searchable interpretation from the published response wording shown below.

    PFD Monitor interpretation

    The IAED owns and designs the triage system, so protocol changes require its consideration and approval.

    Verbatim wording from the response

    “Emergency Call Handlers work using a triage system called Medical Priority Dispatch Solution (MPDS). This system is designed and owned by the International Academy of Emergency Dispatch (IAED).”

    Source location

    2019-0183-Response-by-East-of-England-Ambulance-Service-NHS-Trust
    Page 1 · response
    Published 14 August 2019

    Open published response
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Data last updated 7 September 2026