Manor house with castle in the garden - why is it just £850k?

An incredible Cornish manor house has hit the market at just £850,000. For your money you don't just get a lavish Georgian home owned by Prince Charles and once visited by the Queen, you also get an 11th century castle in the garden.

There's just one small downside - after 20 years you'll have to give it back.%VIRTUAL-SkimlinksPromo%