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It's a "standard" Lee Cooper 853 one. I got it e-bay years ago, could do with a shorter TT but they don't seem to come up in my size :)
But his fillet brazing work is super nice. I need to get it fixed, the BB threads have worn (BB worked loose, I spotted it too late, <--- ejit)
Which means a respray, so I may keep it the original enamel colour, or get something else. Pink I love, but it's hard to resell!
Fyi that looks like a Lee cooper frame, he's done fillet brazed frames for thorn.
If really lucky it can be a Kevin Sayles, there might be initials on the bottom bracket.
I love my thorn which is a blue thorn xtc, the colours on this are great :)