Following the complex build of an extraordinary home costing millions in Mayfair, London, which belongs to self-made billionaire and philanthropist John Caudwell. Having sold Phones 4u in 2006 for just under 1.5 billion pounds, John is now aiming to create one of the most lavish and expensive homes ever to be renovated in Britain. As the build enters the final crucial stages, the programme follows this unique and challenging engineering project as a team of expert trades people and interior designers attempt to pull off one of the most extraordinary renovations in Britain.