The Almeida, in Islington, is a small theatre with big influence. It's an intimate place to discover groundbreaking theatre and get up close to some of Britain's leading actors. The cafe/bar across has a constantly-changing tasty menu, relaxed atmosphere and free wifi. Open all day and great place to spend time even if you're not going to catch a production.
The best thing about any charity shop is that you never know what you are going to find. I have a well tested route around London that includes all of my favourite charity shops. This Oxfam has a great selection of books and often turns up some interesting clothes too.
'The People's Supermarket' offers an alternative to the conventional supermarket chains and focuses on community and local farming. Offering high quality, healthy food at reasonable prices and providing British produce where possible 'The People's Supermarket' highlights the possibilities of consumer power. Become a member and you will be entitled to an ownership stake in the store, which means you have a say in what they do. Membership also entitles you to a 10% discount on all purchases in the shop.