Most of my searching so far leads me to Major Nicolls ...
http://www.blackcountrysociety.co.uk/ar ... cholls.htm
"Major has been reported by several people as making racing and high quality touring frames for other cycle traders as well as for sale under his own name. For instance, David Clement knows that during 1962/3 the firms listed below ordered frames from Major and then provided him with their own transfers and painting specifications which, he then carried out applied before delivery.
Wilson Cycles of Aston, Birmingham
Southgate Cycles of Gloucester
Cliff Peters Cycles of Aston, Birmingham
Criterion Cycles in King Street, Dudley
A cycle shop in Hall Green, Birmingham, whose name cannot be recalled
Bob Mansell Cycles of Hallam Street, West Bromwich. This shop later moved to St Pauls Road, Smethwick on the way to Oldbury"