The air ambulance service will soon be able to fund specialist doctors on flights if it reaches a £4m donation target.

The Thames Valley and Chiltern Air Ambulance (TVCAA) also hopes to fly longer hours if it can reach the figure through public donations.

It costs the service, which covers Berkshire, Oxfordshire and Bucks, more than £2,000 for every mission, with about three deployments a day.

The TVCAA relies entirely on public donations.