eBay and Craigslist finds

defo worth a punt, I recon its a 23" frame, and at a guess a Holdsworth or Butler. Might be worth trying to get the house paint off and see it the original is under there in all its glory ;-)

some one will be along to correct me soon.

Yeah, bought it and will see. Here's hoping they've just painted over the original.
There's nothing on the dropouts, and the paint on the BB is too thick to make anything out. I'll find out when it arrives, I guess!
I'm hoping it's not a 23", looked a bit smaller than that to me but you might be right.