What is the technical difference between a HEMS and a Police heli (or any other heli in fact) in these Medevac situations ?
One difference which was on the programmes, you will have noticed that it was dusk and the phone call received that the HEMS would not fly after 21.00 hours.
This is an important point in that HEMS are not a public service and do not have clearance for night time AD HOC landings.
A large proportion of Police casevacs for this reason occur at night which makes some sense due to the equipment they have on board IE FLIR camera, and nitesun, can be used to survey the landing site.
Hope this clears one point up for you THrre blades