The reason why the BNP have a petting zoo for "ethnics" like Mr. Rustem, is made clear here www.guardian.co.uk/politics/2004/aug/01/uk.race - 70k  and it is, as Emeraude, says framed (by legal eagle Lee Barnes -lol) in such a way as to prevent their being sued if the word "white" were to be included. I understand that the BNP Security Department is headed up by two former South African policemen. South Africa is a long way from Britain, but they are of white ancestry.  
 As for membership of the Black Police Officers Association, the BNP on their website ask if the BNP are racist. It then compares itself with the BPOA implying that the BPOA is racially exclusive. Presumably this means the BNP do not deny being racist "as well". This is of course irrelevent because this article is not about the BPOA or Australian Aborigines but about the BNP.