 On the outbreak of war, the security forces were concerned by the visibility of Churchill's country house Chartwell, its high topographical location and the fact it was south of London making it an easy target for German bombers returning from raids on the capital.The Prime Minister's official retreat of Chequers was also deemed vulnerable to attack.Churchill had use of the Paddock bunker in Neasden, but only used it on one occasion for a cabinet meeting, before returning to his Cabinet War Room bunker in Whitehall.