very little about them in the CR list archives, but a couple chaps remember the name (and one is Norris Lockley, who occasionally posts here):
"In the '60s the bike to ride in Clifton was a Wally Hargreaves with many
TT records to their credit, in the '50s Arnold Elsegood's Minster was the
bike from York, another less known lightweight was a Temple."
Both refer to the brand as high quality, so I think the tubing will be better than gaspipe.