With Tom Mangold Britain's plan to deploy 11 flying radar stations to protect us against surprise attack has gone terribly wrong. The project will be at least five years late; it will cost nearly twice as much as planned - over one billion pounds -and the system still doesn't work effectively. Tom Mangold investigates what's gone wrong with Nimrod, the world's most expensive plane, and reveals startling new details of the defence project which is fast turning into a Bad Deal for Britain.