'The House at the Back' was one of three original houses that made up which famous London address?
No 10 House at the Back No.10 Cabinet Room (10 Downing Street) 10, Downing Street Number ten Downing Street 10 Downing 10 Downing St Downing Street Rose Garden 10 Downing St. 10 Downing Street 10 downing street Downing Street Permanent Secretary Downing Street office No.10 Downing Street British Prime Minister's Office The House at the Back Downing Street 10 Ten Downing Street No. 10 Downing Street Number 10 Downing Street