Bike Forums - Info on a Thornhill 531 Frame

Hi there guys,

I've recently acquired an old 531 frame and was hoping you could give me some help. It’s branded up as ’Steve Thornhill’ who I believe was a bike builder in my local area, Birmingham. However from what I know he didn’t make the frames but bought them in from other frame builders and made them up himself with his own decals and paintwork. I don’t suppose you’d be able to shed any light on the original frame manufacturer by just looking at the frame and style of welding? I’ve attached a couple of pictures and would really appreciate any help you could give.