Bristol Ground School is
the place for groundschool. It has been some years since I went through the mill myself but Alex,Dick and co got my befuddled brain round the concepts of the subject matter and even coaxed a couple of straight 100% passes out of me!!!
On the IR side of things a lot, if not the majority, of guys I know went through Airways Flight Training at Exeter (sadly bereft of the lovely Pauline nowadays). Totally in tune with what the guys need, time scales
et al and they got me through in 5 sorties and a test (thanks
).