Good morning and thanks for all the input. Your comments, and discussions with others, along with thoughts from my youth would lead me to believe that the frame was built for him to his specification.
In about 1991, whilst living in Deptford I recall he had a few bikes stolen from his garage, along with a Specialised Rockhopper MTB of mine. I think he probably replaced the stolen ones with the frame above and a Witcomb, who had a shop less than a mile down the road.
From memory, track and time trial were his favoured cycling disciplines, more to watch than compete, but I suspect this influenced the decisions behind the frames he bought, built up, and rode. I also suspect that T J Quick's location to Herne Hill velodrome influenced heavily the frames he built for the customers he served. The Witcomb is similar in fork design, but is built for conventional brakes.
So I believe that both frames are probably early to mid ninties, built for him, with influence from the builders themselves, and probably tailored to the stock of components in his box of kit at the time.
Again thanks to all for your inputs and here is a picture of the Witcomb before it was sent away for refurbishment.
