Has anyone got one of these outer chain-cases and the corresponding inner part (sorry, no photo of that one) lying around that they don't need? It's a chain-case for a 1939 Ariel 250 OG/OH and were made only for this model (I think). I have various pre and post war Ariel spares to swap or of course am happy to pay good old fashioned cash!
Meanwhile thanks to everyone who helped me with my search for the correct Burman HP 4 speed box. I've now managed to get one - proof that miracles can happen! It needs completely rebuilding but it's all there. I just hope I can get the bits it needs......