<looks at the ground>
If, er, you get, um, bored of it...
I think you have plenty of british steel already!
Looked it over today, and I'm convinced it has hardly been used, just left damp at some point. The rims show no braking surface wear, its running meaty shimano brake blocks, no polished bits (from shoes) on the cranks, Velo GelTech seat still with gel in it, black seatpost with no scratches, and covered in old grease (lets hope the BB comes out as easy!).
Scraped the rust off the BB (slightly concerned around seat tube, will wire brush before getting it blasted) and revealed the frame number, possibly confirming my 1990 hunch (from the rims and crossover Exage country / 300LX components).
The fork is very familiar and I've noticed it on a whole load of British handmade bikes of the era - anyone know about it?
Quick run down of how we start:
Frame & Fork: Orbit 531
Handlebar: Faded Classic Bullhorn
Brakes: Exage Country
Brifters: Exage 300LX
Derailleurs: Exage 300LX
Cranks: Exage 300LX
Rims: Mavic Oxygen M6
Saddle: Velo GelTech