Nick Griffin could have explained to the Queen that Fascist parties have never come to power in countries with monarchies except in one (admittedly significant) case where they abolished that institution as quickly as possible, and that it is his own party's policy to depose her as apartheid South Africa did and as Ian Smith's Rhodesia purported to do.
When not discussing Her Majesty's own descent, both from the "negroid" Charlotte of Mecklenburg-Strelitz, and, via Elizabeth of York with her Moorish antecedents, from Muhammad. Queen Charlotte, after whom the city in North Carolina is named, is shown clearly with light skin but African facial features in contemporaneous portraiture, and was spoken of as "negroid" without any self-consciousness during her lifetime.
She was descended from the part-black Royal House of Portugal, a member of which, Catherine of Braganza who was the consort of Charles II but from whom no one is descended (unlike her husband...), is shown looking just like a mixed-raced Briton of today in a portrait displayed in one of the private areas of Durham Castle. I sat under it only on Monday, waiting for the champagne to flow and the Vice-Chancellor to speak at the launch of a friend's festschrift. It did, and he did.
This really would have been the last opportunity for Griffin and Her Majesty to have had that conversation. The BNP took barely half as many votes this year as last year, fought 38 council seats and lost 36 of them, and lost every seat on Barking & Dagenham Council, of which it had thought that it might take control. Like the NF before it and the BUF before that, the BNP was always talked up by its sectarian Left opponents, in order to make themselves appear more important than they really were. This remains very much the case with the teaching of the 1930s. Mosley was never really terribly important. Nor was Griffin.
Every 30 or 40 years, this tendency reappears to make a lot of noise before going away again. Thankfully, I will be in my sixties or older before it happens again. And thankfully, it would, once more, only last for a few years. That is how these things work.