Following a lead from Nick (thanks!) I'm trying to contact a stall holder who was at Enstone. Here's Nick's description.
"He attends lots of rallies and sales, selling magneto parts (mostly Wico A) all laid out on his table in neat little boxes, also new Lister, Wolesley etc silencers. Curley haired fellow, don't know his name though."
I want to buy something off him, not complain, so if anyone can help me off list, I'd be most grateful.