Why on earth would the Queen be embarrassed by the BNP? It's in the family

Interesting news that BNP leader Nick Griffin has decided to pull out of attending a Buckingham Palace garden party in July "for fear of embarrassing the Queen". 

Whilst my main advice to Mr Griffin on his future schedule is that he should flush himself down the nearest public convenience en route to where he belongs - in the sewer - I'm surprised that journalists and commentators should feel the Queen would be embarrassed by Mr Griffin. Fascism runs in the British royal family. The Queen's uncle, Edward VIII (latterly the Duke of Windsor) was a well known Nazi sympathiser, and the Queen Mother was apparently a staunch supporter of the 1980s Botha regime in South Africa. With people like these as ancestors, the Queen would have probably been able to have a perfectly reasonable conversation with Griffin. But instead she will have to make do with the BNP's Greater London Assembly member Richard Barnbrook instead. Oh well. If only the Queen Mother was still alive to say "I like that Richard Barnbrook, he's the kind of fellow this country needs..."