Hi Steptoe, by the look of it, it is a bit of a "Bitsa", to me it looks like a Model 1 or 2 Romoto base, (a bit hard to tell by the photo), it has the cigar fuel tap (could be late Romoto or Model 4) has the Romoto Circlip carby and exhaust, it is a Model 4 starter & cowel, Post up the engine No as this will help determine what it is, I may be a bit off but would be close without some other Pics
