If you missed it, Dispatches has an interesting feature on the payment of tax and the Duchy of Cornwall.
Interestingly the programme must have been made before the revelation that Margaret Hodge's family company is perhaps not all it should be, when it comes to tax matters.
Hodge, however, does make a good point that although the Duke of Rothsay pays income tax, it is done so on a voluntary basis. The state has no powers to demand tax from him. No one, she indicates, should pay tax on 'a voluntary basis'. Quite right. There should be rules and they should apply to me and Charles Mountbatten equally... oh, and to Margaret Hodge.
The thrust of the programme is that the duchy pays neither corporation tax nor capital gains tax, and in not doing so has advantage over other commercial entities doing exactly the same thing; that because of this the estate makes a great deal more money than an equivalent that wasn't owned by a royal and that it is all rather 1913 rather than 2013 in its running. A side line in teh programme is that for all the Baron Renfew talks about green this and green that, some of his business affairs don't appear to reflect his stated concerns.
Time the thing was ended and the heir to the throne relied only on the £16 million he gets from the state to run his office.