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MI5 (the internal security service) is in Thames House, Millbank and MI6 (the external security intellegence service) in Vauxhall Cross, designed by Terry Farell and reputed to have cost 260m. Spies can buy their equipment at the Spy Shop in South Audley Street, Mayfair, passed on my Mayfair walk

The CABINET WAR ROOMS are part of a 6 acre complex of fortified offices beneath Whitehall constructed in the 1930s. The rooms served as the wartime HQ used by Churchill, his war cabinet and staff around the clock. They remained unused from August 1945 but are now open to the public daily. The admission charge includes an audio guide. Access is from Clive Steps, King Charles Street. A Churchill museum is included in the attraction. Tel 020 7930 6961

The above ground section of the Admiralty citadel can be seen at the junction of Horse Guards Road and the Mall. The Northern line provided a number of deep level shelters. Four were public shelters with bunks for 8000. Chancery Lane and Clapham Common were for government use during V1 and V2 rocket attacks. Stockwell housed American troops and Goodge Street was a D-Day command centre for General Eisenhower. This is now used for archive storage and can be seen on my Bloomsbury walk.Bloomsbury walk.

The FREEMASONS have an undeserved reputation of being a secret society since the public are welcome to visit their HQ in Wild Street, Covent Garden. The library and museum are open Monday to Friday 10-5 and free guided tours of the building are generally available weekdays at 11am, noon, 2pm, 3pm & 4pm (phone to check). Tel 020 7395 9258.
The Freemasons also occupy the former Middlesex Sessions House on Clerkenwell Green featured on my Crime & Punishment and Clerkenwell walks.

Read more in 'Secret London' by Andrew Duncan 2009

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