I don't think the Royal familly have ever voted but that's not the way it works.
The most notable case was the passing of the parliament act.
This was the act that meant that the elected house of commons can over-rule the house of Lords - how do you get something like that passed through a parliament where a house of Lords has a veto?
Well if you're Llyod George you get the King to promise to create hundreds of New Lords - then you go and black mail the existing Lords.
Then more recently there was the Australian Crisis of 1975 when the Queen's representative the Governer General removed the Prime Minister
http://en.wikipedia.o...onstitutional_crisis.
Why does one have to be loyal; to the BNP or the Queen?
Because the Queen is head of the Commonwealth including Jamaica, Barbados, Papua New Guinea and Grenada and has a well reported great love for the role (As she never ceases to go on about in Christmas Broadcasts)
She is unlikely to take kindly to those who maintain the inferiority of half her subjects based on what colour their skin is!