Not surprised with general negative attitude to GPS in UK given the fact that CAA have been casting GPS as the devil incarnate for the past decade !
We have some catching up to do so please listen carefully !
GPS Can be primary Nav above MSA and if you have the right GPS it can be primary for an approach as well. Unfortunately many of our new GPS approaches rely on conventional nav aids for the missed approach procedure (how daft) - so CAA must have decided that NDB must never be forgotten !!!
I teach IMC ratings and I teach use of GPS and if your aircraft has GPS approach capability then that as well. Call it a modern approach to IMC training for real world real aircraft operations. There are many instructors who are passing on a very rigid training syllabus that hasn't changed in donkeys years, yes pass on the old stuff but please get to grips with the new stuff as well.