Thanks for the good wishes and the information. I am in the Minehead area and there are a few clubs here. I doubt the bike will be finished before the winter though!
I have bought a non-running 250 Ossa Mar which I am currently trying to restore - not immaculate, just to a good usable state. I have never tried trials but always wanted to. I intend to visit a few local events as a spectator and hope to meet some of you then.