Peter Kohler asks "...Rims: was there a British make sew-up rim at this time (1962)? ..."
the 1962 Holdsworth Bike-Riders 'Aids' catalogue lists Constrictor Conloy 27" sprint (tubular) rims.
Peter Brueggeman
La Jolla California USA
4peebee(at)peterbrueggeman.com