You could probably start up an air ambulance pretty cheaply really. The current ones are going down taking taking the hospital to the patient a la Afgan. I know it is rough in some parts of the UK but you dont step on an IED
How about
Buy a Bo 105 cost £ 350k Running cost about £ 600 an hour
Insurance and annual inspection £ 40k
AOC charges £ 11k
2 pilots say £ 50 k each a year
2 paramedics say £ 30 k each
Probably get a load of help running the AOC by running off someone else's !
Obviously a few other things but a very very basic service, which would be better than nothing !
No I have never run a HEMS machine but I do know an awful lot about running machines and AOC's and all the costs that go with it