>A spokesman for the Grosvenor Estate said the family trust paid inheritance tax of 6 per cent on the value of its assets every ten years. That was done to keep

>A spokesman for the Grosvenor Estate said the family trust paid inheritance tax of 6 per cent on the value of its assets every ten years. That was done to keep continuity of ownership rather than to avoid the levy. >He said: “The idea that the Duke doesn’t pay any inheritance tax is completely wrong.” So which is it, and how does this thing actually work?