Thanks everyone and topdad i'll definitely let you know, here are some pics of the bike, I'm missing lots of bits not least of which are nearly all the nuts and bolts!
Missing as a start....chainguard, speedo, lights, horn, tank badges, battery clamp, head steady, steering damper, loom, switches, ammeter, de comp lever on the head, brake rod, regulator etc etc
Does anyone what wheels and guards should be fitted to a rigid 1949 b31? I suspect the ones i have are wrong, the rear is a crinkle hub.