It's just a short hop from Buckingham Palace and has been home to such luminaries as Sir Winston Churchill and Lord Mountbatten.

Now, a flat has become available for sale in Admiralty Arch for an estimated £150 million. The apartment is believed to be the most expensive ever put on the market in London after topping One Hyde Park, at £140million.

Estate agents expect that the 12-bedroom property will go for as much as £9,000 per sq ft – far higher than the £1,500 City of Westminster average.