I have actually managed to find most of the types in 1/72 (but almost totally frog or airfix) on EBay. As mentioned, the issue is going to be the transfers (sorry Decals :-). My guess is that these are going to be an issue due to age and most of them are not replaceable - or at least I can't find them at Hannants :-(
I have been concentrating on 1/48 lately but today spent the day with my grandson on 1/72 - him making an Italieri Phantom and me making a Revell P47. It was great fun and somewhat more productive than, say, an Accurate Miniatures B25 or the current kit - an ASR Sea King to match the local mob at Wattisham in 1/48 where it seems to take a pot of paint to paint anything and 50 hours to get close to finish - I haven't actually tried 'finish' yet.
So I may well take up these EBay FAA topics and then struggle for transfers afterwards. At least I will start to get what I want.
Thanks for all the pointers.
David