Sorry if I'm behind the curve here but, don't you have a ratings system for helo types already in the UK?
As I understand it, somebody gets a licence on one type, then he has to train and pass another check to get a rating for every subsequent type he wants to fly.
Isn't five hours only the minimum conversion time? It may not sound much, but if he's inexperienced or it's a more complex type, he's not going to get it in 5 hours.
It seems to me you guys in the UK have to contend with a hell of a lot too much regulation by your CAA anyways.
Do you want more?