Was in central London two days ago when I stumbled across a nice little shaving supplies shop in an arcade off Jermyn Street, St James. Run by a lovely lady who is very knowledgable and has a nice array of items. From brushes to vintage razors, soaps etc. They have a website http://www.stjamesshavingemporium.co.uk/ and are very welcoming in store. If you're in the area pop in and take a look