It's important that people realise exactly what's being considered here before jumping to conclusions. A HEMS tasking can be either transporting a patient or delivering medical aid to the incident site.
All that has been asked for is the ability to deliver a member of the medical aircrew or equipment to an incident where the aircraft would not be able to land, and get said medical man back out again if necessary. In other words, winch him down and maybe back up again.
That's it. No winching up of stretchers, patients etc into the aircraft. No night winching, no cliff-face winching, no IFR winching, no maritime winching, no winching off seamen from capsizing yachts in Force 10 gale 70 miles out into the Atlantic, no "poaching" of patients from the RAF, MCA or any other acronym you care to mention. No anything else at all.
If it proves to be a white elephant that takes up lots of funds for training and is never used "in anger" then it will be dropped and funds channelled elsewhere.
If it works and actually adds something to the service then great – build up experience and maybe later add a little bit more like lifting the patient/stretcher out of the inaccessible area when necessary and placing them in a more suitable area from where they can be physically lifted into the aircraft if transporting is deemed necessary.