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In almost constant use by prime ministers for 300 years, the topsy-turvy townhouse at the heart of government has a plethora of frustrating issues due to its age and design

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Creaky, idiosyncratic, mice in the basement and with “doors that lead nowhere” – Number 10 Downing Street may be one of the most famous addresses in the world, but for many of its staff, conditions in the warren of poky rooms behind the famous door represent the perfect metaphor for the running of the state.