What's your current position on assets like boats etc?

Hi Gareth. I read your "Big Kahuna" book over the Christmas break. In the FAQ section at the end of the book you said that, for pragmatic reasons, the tax would be limited to land, houses and business assets. But I get the impression from your recent blog post, and the Paul Henry interview, that you'd now like it to apply to other valuable assets too: luxury cars, boats, art works etc. Could you clarify your position on this and, if such assets would be included, clarify how they would be identified and valued? (Except perhaps as a mandatory surcharge on the insurance premiums for such items, but that seems like an unorthodox approach.) I ask because I can't imagine how the practical and pragmatic issues would be addressed if such assets were included.