Go to a bar where summer can't get you: members' bar Milk & Honey, Poland Street doesn't do sunlight. It's very dark and very cold, particularly with a Mojito in your hand. Also try basement restaurant Joe Allen, Exeter Street, W1, which plunges you into a dark cold underworld miles away from Covent Garden. Or the lobby bar at The Hempel (Bayswater, 020 72989000) - "cool" cool, as well as cold.