Who decides these things in the UK?
Nobody, its all EASA. And with them the paper work is more important than standards of instruction or syllabus.
As long as your SMS system is hunky dory and you have manuals on everything from flying an aircraft to going for a pee your sorted.
The examiners are meant to do the quality side of things. But apparently most of the good uns are fed up with the cost and ballache of maintaining the privilege. And will be retiring when they are next due.