My decision has been made and my collection has now reduced: what I decided in the end was, for now at least, to keep the following:
Bodies: M3, R3A, IIIa
Lenses: VC 15, 25, 40; CZ Sonnar 50, Summarit 50/1.5; Summar, Summitar; Elmar 3.5; Tele-elmarit 90 and Tele-Elmar 135.
I'll probably reduce my vintage LTM kit but at the moment they're fun.
So, much against most people's advice I have sold my M2, MP and M7, and my CZ 25/2.8, my 35 Summicron v4, the Noctilux, the Summilux 50 ASPH and the 75/2 APO and others - all brilliant items which I'm sure the new owners will enjoy using.
I'm pleased, if slightly surprised at my decision and it's been long enough now that I don't have any regrets.
The best thing is that I got back approximately what I paid for the kit in the first place - OK some items were down but others went up and overall I came out having had effectively free use of a lot of very nice kit for two or three years.
I am now looking forward to the simpler life, concentrating on photography and not gear.