Colcham
Colcham were motorcycles produced from 1962 to 1972 as the result of a partnership between John Collins and Alan Chambers.
The pair built grass-track and a few speedway machines. They would fit any engine specified by the customer. For his own racing John Collins used Velocette units. They made their own front-fork dampers and fuel tanks, but most of the other part were bought-in.
Sources of Information
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X