One I do know of is Sydney Braham. His shop was on Hampstead road, London.
He built clowns bikes and unicycles for Circuses. I bought his BSA C15
motorcycle from his son many years ago. It was in a garage next to their old
home. I remember there being a pile of alloy rims and other bicycle bits but
I wasnt into bicycles then.....
Mark (wishing for a time machine) Stevens .Dingwall