Cheers Guys,
For the feedback and information.
The "imps4ever" site was where I got my first lead from, that is Ken Horwood and his Norton-Imp creation from 1976. I'm not totally sure but I have a faint recollection of a Manchester Motorcycle dealer putting together some Norton Imps in the late 60s or early 70s, but I could be wrong, about the location of the dealer.
Frank Barlow, (Bomber), I can be contacted on email j.hall441@btinternet.com, I would be interested in which Imp engine you used, 875cc, 998cc, or the later Talbot 930cc lump, what type of Primary side drive link-up you selected, gearbox ratios and sprockets, carb' set-up and the weight and tractability and power output of resulting machine.
Many Thanks
JBW