To the passing motorist, there is nothing about Wood Norton Hall to identify it as the site of the BBC's secret nuclear bunker. Who knew there even was such a thing? According to the official line, Wood Norton is a training camp, where sound engineers are sent for residential weekends. But it's what you can't see from above the ground that is intriguing. Buried 10 storeys into the hillside is a fully functioning nuclear bunker, built at great expense in 1966, at the height of the Cold War. Those involved in its construction were obliged to sign the Official Secrets Act, and even now you won't get a peep out of the BBC press office to acknowledge the reality. Measuring 175ft long, the bunker - known to high command as Pawn: Protected Area Wood Norton - remains ready for service in the event of an attack on London. It is said to have beds and ping-pong tables and is connected by tunnels dug into the hillside to a mast on top of the hill which is fitted with a super high-frequency satellite dish. According to the Government War Book, a Cold War document that was declassified only last year and which sets out what happens in the event of a nuclear strike, Wood Norton was a vital tool in keeping the country informed should chaos descend. While the Cabinet would be secreted away in another bunker in Corsham, Wiltshire, pre-recorded tapes kept at Wood Norton would be broadcast across the nation in the minutes before any bomb was dropped.