I've done some training with London HEMS, although they're really established and they've got quite an extensive scope of practice. They're well funded enough to be able to operate quite routinely as well unlike other places like Oxfordshire. The delivery varies across the UK as well like up until recently in Ulster it was mainly provided by the military and in Scotland it's usually private companies.
Half right - its a private company delivering on behalf of Scottish Air Ambulance.
I am guessing you are a clinician of some form; helicopters are an expensive business, you're going to have to rattle a lot of tins, and people are probably going to ask 'why do we need another service when we already have one?'. But please, it's your time, burn through it however you wish......