I'm almost lost for words. Just when you think the UK CAA and EASA can't screw it all up even more, they do. It really does seem like they're out to get us.
This has nothing to do with flight safety, that much is certain.
What are you supposed to do with your previous type ratings - do three sim sessions and an expensive and pointless check ride every three years on each plane you don't currently operate, in case you need the rating for a future job?? To be honest, if anything, that is bad for safety, as you're then getting negative training for the aircraft type you do currently operate..
The bottom line seems to be this - Unless you work for an airline at home which you can reasonably expect to stay with for your whole career, this profession will get too expensive and too much of a ball ache to be involved with in Europe.
Jesus wept.