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Lengthy delays in getting ambulances to people in need are being investigated by St John, as demand on its service, and staff shortages begin to burn.
It is investigating 19 incidents when an ambulance was delayed and looking at the impact that had on the patient.
It is also racing to fill 150 vacancies across the country. The government is spending millions helping with training and recruitment efforts, but there are fresh calls for the whole service to be brought into public ownership.
Nita Blake-Persen reports.