Got some 20/50 by Rock Oil. Found a great little bike shop called Macs Motors in SW London down Tooting High Street - Power to the People! - down the side of Tooting Broadway station on the way to Colliers Wood/Wimbledon. Mr Mac was very helpfull: "20/50 is it? For an old XT you say. We got loads of that here mate, always got some in, all the old Beamers love that stuff." Got an oil filter off him too. And some brake shoes. Could of got a load of other stuff as well, but I managed to resist! It's only a small shop, with a workshop round the back, but they seem to cram everything you could ever need in there. Worth a visit if you're in the area and need something. Thanks to for all the help and input. The old thumper is purring. Big Ta fred