1. Nuffield Trust. Ambulance response times. www.nuffieldtrust.org.uk/resource/ambulance-response-times
2. NHS England. Ambulance Quality Indicators Data 2022-23. 8 December 2022. www.england.nhs.uk/statistics/wp-content/uploads/sites/2/2022/12/20221208-Statistical-Note-AQI.pdf
3. London Ambulance Services annual report 2021-22. www.londonambulance.nhs.uk/download/33665.
4. NHS England. NHS slashes longest waits for care despite record numbers of most serious 999 calls. 11 August 2022. www.england.nhs.uk/2022/08/nhs-slashes-longest-waits-for-care-despite-record-numbers-of-most-serious-999-calls.
5. Ambulance trusts declare critical incidents amid “unprecedented” and “sustained” pressure