I think by far the biggest problem with all this is the severe shortage of instructors in the UK; those that really know the type and the equipment.
These avionics - and I mean anything beyond a GNS430, autopilot, etc - are pretty complex if one is to understand them thoroughly. Sure, you can just get in and hand fly, but is that good enough?
And a lot of it simply cannot be understood unless the pilot is a practicing IR flyer.