Churchill bunker 'not bomb-proof'

Winston Churchill complained he had been "sold a pup" when he discovered his underground wartime headquarters in Whitehall were not bomb-proof.

A letter showing Churchill's annoyance when he discovered this security flaw is on display at the Cabinet War Rooms.

Despite his protests, the prime minister continued to work from this bunker during the Blitz.

But an exhibition opening next month in the former headquarters, will show how vulnerable this building was to attack - and how fortunate it was never to have received a direct hit.