I think that most of people knows this shop, but if you don’t, now you’ll know.
Calumet is a great shop for professionals or amateurs photographers! They’ve got two shops in London, I’ve been to the one in Soho. But there’s shops in a LOT of places. You can search the nearest to you here. They rent materials, repair, sells new and used equipments.
One thing that really worth is the magazine CalumetFocus:
It brings great reports and also the products with its price.