Jones's plan aimed to create a huge palace covering the area now known as Downing Street, Horse Guards Parade, Whitehall and large swathes of St James' Park.

BBC: The landmark buildings that never were

The Daily Telegraph has photographed Mr Jones emerging from a chauffeur-driven Jaguar after a journey of no more than 100 metres between the Wales Office in Whitehall and a cabinet meeting in Downing Street, which is just over the road from Gwydyr House.

BBC: No 10 trip earns Welsh Secretary "Jones the Jag" tag

They visited the Wales Office to meet Secretary of State for Wales, Cheryl Gillan, at Gwydyr House, Whitehall, and then have their photograph taken outside 10 Downing Street.

BBC: Prime Minister David Cameron's birthday tribute to Urdd