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What is the postcode of Buckingham Palace It has a unique postcode of SW1A 1AA Other unique postcodes in London are:- House of Commons - SW1A 0AA House of Lords - SW1A 0PW 10 Downing Street - SW1A 2AA 11 Downing Street - SW1A 2AB HM Treasury - SW1A 2HQ IP | ||||
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