Try Mr Cad. Same guy, Alex Faulk running it from the 70s. Hopefully he has others in training for when he finally retires. He recently bought all of the 'Croydon Leica Camera Shop' stock when the owner died.
If anybody has stock of anything, or knows what the full story is, he will.
Was in there a few months ago and a customer walked in wanting 8mm B&W cine film. Yep, they had it.
If you are ever in London, well worth a visit to the shop, it is an Aladdin's cave of gear. It is just a short walk from Victoria train station and a short walk from the posh nikon only store, who have the most amazing second hand nikon film camera collection.