Nick and Christian Candy, the developers of apartments for the super-rich, are heading for a high court clash with the Qatari royal family following the withdrawal of plans for the UK’s most expensive residential scheme at Chelsea Barracks.

CPC Group, the development group run by the Candy brothers, has lodged a claim against Qatari Diar Real Estate Investment, the property company backed by the emirate of Qatar, a long-time business partner of the UK developers.