10 Downing Street. There's a Prime Minister in the attic, a coffee bar in the basement, and a wallpapered labyrinth of romance, crisis and heartbreak in-between. Set in the only terrace house in history with mice and a nuclear deterrent, it's the only knock-through in the world where a hangover can start a war. The government will be fictional, but the problems will be real. We'll never know which party is in power, because once the whole world hits the fan it barely matters. This is a show about the building and everyone inside. Not just the Prime Minister upstairs, but the conspiracy theorist who runs the cafe three floors below, the man who repairs the lift that never works, the madly ambitious ‘advisors' fighting for office space in cupboards. Oh, and of course, the cat. Number 10 is all of Britain in a house: it's British history under one roof. It's how we all got into the mess we're in. It's also our only hope of getting out of it.