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In fact the cost factor is irrelevant, it's the presumption that Mrs. Windsor is the head of the church, the head of the army, the head of the state, the head of this, that and the other, that cannot be accepted.
And that Charlie-boy will succeed her and be all the same of this, and that his son will one do the same.
They might make trips to Australia and New Zealand and express a few words of sympathy months later about an earth-quake (New Zealand) and some floods (Australia) to give themselves an image, as Wiliam did, but then anyone could travel at the expense of the State and rehearse a few words in order to claim to be heir to all the above-mentioned titles, if the State commissioned them to do so.
The Windsors have lost in Australia, where the number of people in favour of them not being monarch of Australia exceeds thenumber of those in favour.
A recent poll in Australia has confirmed that William would receive more no-votes in a referendum on the Windso-monarchy than his grand-mother.