I do have an alloy Graham Weigh, black and destickered. Was swapped out for a smaller frame. Got a few paint scuffs but very light and stealth looking. It measures seat tube c-t 58cm and top tube is 57cm centre to centre although seat tube is 54cm c-c. Feels larger than a 56 to me. Was set up with flat bars.
Anyway, if you're interested, pm me your number and I'll send some photos from my phone. Looking for about £35 and ann post from Brighton.