An all night service has just been launched on the Underground, but London is still very far from being a 24-hour city. Just try getting a drink after 1am. Thank heavens for the Polo Bar opposite Liverpool Street Station, which has saved my bacon on countless occasions when I just didn't want to go home. It's open 24 hours and is always full of taxi drivers, shift workers and night owls. I always order a sausage sandwich and a mug of tea, but I've also heard good things about the burgers.
176 Bishopsgate, London EC2M 4NQ; polo24hourbar.co.uk