See inside one of London’s most expensive houses – the modern mansion worth £40m

Businessman and philanthropist Caudwell, who sold his Phones 4u chain for just under £1.5 billion in 2006, bought Mayfair House for £87 million in 2012 and a few years later embarked on a total renovation. It was also the subject of a Channel 4 show, which aired earlier in the year, ‘Britain’s Most Expensive Home: Building for a Billionaire’ that has been described as a ‘supersize Grand Designs’ – that spiralled £58 million over budget. A photo posted by on See: Bill and Melinda Gates’ new $43 million in San Diego home Britain’s most expensive mansion, in central London, isn’t even John Caudwell’s main home. Rather, it’s a party retreat for his wealthy investors. A photo posted by on The home features a 120-capacity ballroom – a place for charity balls and evening galas. The house is the most expensive in the UK firstly, because it is so enormous, 43,000 sq ft of living space in total and secondly, as a result of the quite staggering levels of eccentric opulence and design details that has gone into the renovation. See: Ben Affleck’s luxury country home is a masterclass in classic Southern-style A photo posted by on The property features an indoor river (below), designed to be evocative of Thailand, that meanders out from a faux cherry tree, and rungs through the house. A photo posted by on Then there’s the quilted, soundproofed cinema room decorated with black-and-white photographs of Hollywood stars with the faces of John Caudwell’s family superimposed. A photo posted by on ‘The value in my house is the house itself, but I don’t keep any valuables. You can’t steal a marble staircase,’ John explained. A photo posted by on The home can be seen it all its glory on Channel 4 (opens in new tab). A photo posted by on