Despatch mechanism.
HEMS helicopter tasked by NHS Ambulance control to fly 30 miles to a roundabout outside the Midlands largest trauma centre. Reason: no wheeled ambulances available to attend an RTC at that location.
That trauma centre requires a wheeled ambulance transfer from the hospital helipad to A+E. None available to be put on standby at the helipad.
Ambulance control 'ordered' the helicopter to take the casualty to another hospital 20 miles further away as it had a rooftop helipad.
Job refused by crew. Much wailing and gnashing of teeth by Ambulance control and threats of dire consequences on the (NHS) HEMS crew.