An air ambulance service in London has appealed for £750,000 of funding to keep the service in the air.
London's Air Ambulance, which was set up to allow patients to be treated at the scene, is based at the Royal London Hospital in Whitechapel, east London.
The service, the only one of its kind in London, now needs £5,000 a day to run as costs have risen over the years.
As a registered charity almost half the cost is donated by the NHS while Virgin guarantees the lease on the helicopter.
The air ambulance carries a trauma doctor, paramedic and vital surgical equipment and takes 15 minutes maximum to reach any accident within the M25.
Andrew Cameron, of the London's Air Ambulance charity, said: "What people don't realise is that we rely on charitable donations to stay operational.
"While all Londoners hope that they never need to rely on LAA, many who have been helped by our team certainly owe their lives to the service and it's important that we keep this vital service in the air."
The ambulance has been involved in all major incidents in London over the past few years including the Cannon Street, Southall and Paddington train crashes, the Soho Bomb and the terror attacks on the London Underground on 7 July 2005.