Thanks 33d6, I have joined the VMCC and will post any results I get. I have been over the bike quite closely and my impression is that the frame, forks, stays, wheels and gearbox date to one era. I am basing that on fit and level of corrosion more than any knowledge of vintage bikes so you may well be right about the back wheel. the mudguard stay obscures the grease nipple and the brake stay would be in the way of the stand. The tinware is a very recent addition as are the engine plates and back brake set up although whether to an original pattern or pure invention I don't know. The rear brake pedal is a barely altered bantam. It gets worse, the tank hangers appear to have been put on to suit the tank. I owned a Levis years ago, an unrestored flat tank two stroke belt drive with a retro fitted clutch clamped to the down tube. Quite different to this! I have thoroughly cleaned the area of the frame numbers but they are so hard to decipher that I may be on a hiding to nothing. Still, it makes me smile and takes up little space in the junk room.