You can do pretty much anything you like in London. But it will probably cost a fortune - and might not be worth it anyway. That's where our highly opinionated guide comes in. London is full of excellent places to go and things to do that are totally gratis. The best things in life are. Emmy Watts (brilliant author of our Opinionated Guides to Eco London and Kid's London) is back with advice on the very best outings that won't eat your overdraft. From galleries and green spaces to flower markets and subterranean tunnels, discover Emmy's unabashedly opinionated selection of the coolest, most creative places in the capital. This is part of a growing series of opinionated guides which offer straight-talking insider's advice on what to do and see in London.