Nick Griffin has been credited with trying to root out antisemitism from the British National Party

Credited by whom? Nick Griffin himself?
Yes, the BNP do make much play of the fact that one of their municipal councillors in Barking, Essex, Pat Richardson, was born Jewish, but underneath Griffin's Savile Row suits and Cambridge degree the BNP are still the same bone-headed, thuggish, anti-semitic and thoroughly unpleasant organisation they've always been ever since the days of Colin Jordan and his ilk.