I can't pass without dropping in, Orcs Nest is a small independent boardgame, D&D etc store that's been around forever(1987)... and has the best logo. Good selection of games for younger kids too.
The AA is Britain's oldest school of architecture, but anyone can take advangte of the great work going on there. You can catch really interesting public lectures and free exhibitions throughout the year. There are also occasional installations and event launches, a bijoux cafe and brilliant bookshop. A great place to hang out with the builders of the future.
I am definitely not precious about the materials I use to make my work, but every so often I find myself in need of something more specialised. L.Cornelissen & Son is a beautiful and well stocked art supply shop with extremely knowledgable staff.
A phenomenal cultural place which brings to London the best contemporary dance talent and productions. Sadler's Wells is one institution that makes London such a an amazing place to live in. Always ground-breaking and risk-taking programming. The best dance venue in the world, thanks to the amazing artistic vision of Alistair Spalding and his team. Leading by example and always doing it with heart.