F&S Marriott Photographic have ceased trading. I couldn't see them in the list of dealers. Fred Marriott continued the business after his wife died, but recently decided to call it a day. He sold vintage cine cameras, projectors, bulbs, editing equipment. Another loss to the hobby; the best deal I had was a 25mm B&H lens for £45.

Looks like Denton Photo Optics of Manchester have also ceased trading; they were a good source for obsolete projector bulbs at realistic prices.