I can only speak for England and Wales, as Scotland HEMS (AA) is run by the Scottish government.
The industry is littered with individual AA 'charities' trying to do their bit for the 'local' community. It is not joined up and thus wastes an enormous amount of public charitable money as a result. Very very few of them do night. The only common factor (ish) is that Bond do "most" of the servicing/a/c/spares. Ironically the motoring organisation The AA, tried to pull it together at one stage but failed miserably.
To populate the map further with a specialist HEMS/AA operation, is folly. There isn't the catchment area, nor the demand to keep this function alive for more than a few months (even in the cheapest twin on the market) The suggestion that S76's may be considered is financial suicide.
Once more - this particular charity has started on the wrong foot and my feeling is it will (like PAN news' comments) fade away like the other two.