Can anyone tell me if I can convert my 22b to run on LPG without loss of performance. Is it really as good as the LPG mob make out? (30000 miles p.a. at 20 MPG is getting a bit hard on the pocket. Does anyone want to sell me a bicycle?)

Do a search on LPG, we had a discussion running about 6-8 weeks ago.
Basically, not yet - but if you find a fitter that can do it please post.

The new type of LPG installation that injects liquid instead of gas only costs about 3-4 % power. There is a guy in Belgium running the older type gas-LPG system and he is apparently quite pleased.