<unk>  is a registered<unk>  that operates a helicopter emergency medical service (HEMS) dedicated to responding to serious trauma emergencies in and around<unk> . Using a helicopter from 08:00 to sunset and rapid response vehicles by night, the service performs advanced medical interventions at the scene of the incident in life-threatening, time-critical situations. The<unk>  was founded in 1989 in response to a report by the Royal College of Surgeons, which documented cases of patients dying unnecessarily because of the delay in receiving prompt and appropriate medical care. The<unk>  was the first in the UK to carry a senior doctor in addition to a paramedic at all times on a helicopter, introducing a system that reduces the death rate in severe trauma by 3040%. The helicopters are hangared at RAF Northolt, but operate during the day from their base at the Royal<unk>  Hospital in Whitechapel, East<unk> , a helicopter can reach any patient inside the M25<unk>  orbital motorway, which acts as the service's catchment area, within 15 minutes. Missions commonly involve serious road traffic collisions, falls from height, stabbings and shootings, industrial accidents and incidents on the rail network. The team can perform advanced life-saving medical interventions, including open heart surgery, blood transfusion and anaesthesia, at the scene. The<unk>  operates 24 hours a day, serving the 10 million people who live, work and travel within the M25. The service treats an average of five patients every day.
London's Air Ambulance Charity
Scotland's Charity Air Ambulance
Hampshire and Isle of Wight Air Ambulance
SA Ambulance Service
East of England Ambulance Service
Tees, East and North Yorkshire Ambulance Service
Community first responder
NHS Barnet