Anyway, I got a hold of Swinnerton through Facebook and sent them the serial # and some pics of the frame. This is what they sent back...
Hi Ian, this frame was one of the 1st frames to built in the UK with Columbus Max tubing & power forks. The whole back end was chromed then painted over, this particular frame was built for John Herety, former UK road race rider, Tour de France rider and current Rapha-Condor-Sharp Team Manager. It was originally built using Campagnolo Record Through out and was used in our shop Catalog.
They also concur that the frame can not be repaired. I will check out the frame and see the extent of the rust and then contact some welding shops and see if any of them can braze it closed. No harm in trying.
P.S.
Are the forks worth selling?
Ian