Noel - you could also try some of your local brake & clutch specialists - anyone who machines flywheels will also be able to do this job. Some of them may get a bit narky about grinding bike discs, especially if you get below the minimum thickness ( its 4.5mm or 5mm on those old discs as I recall...) - just tell them its a vintage bike that is going in shows, and is hardly ever ridden !!

Thats worked for me before.....as long as you don't go under 4mm on these discs, they will be fine.
If you end up needing to source some disc rotors - for old stock ones, try Penrith Wreckers. These guys specialise in pre-85 stuff.
