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.
A great place to start the day if you are in South London is Federation Coffee in Brixton Village. The food is great and so is the coffee. This is a very chilled place where you can get both and indoor and outdoor experience (even though the whole place is under the Village roof).
Spring always arrives earlier to London, and London shows its most beautiful face during the spring. If you live in London, or if you come to visit, bring your training shoes and take a morning run along river Thames in Chiswick. Between Barnes Bridge and Hammersmith Bridge, there's a great trail on both sides of the river. And if you take the run in March, you might run through this wonderful Alice-in-Wonderland cherry-blossom landscape.