[From Wikipedia, but the citations are good]
Until 2009, when it was challenged in the courts on grounds of racial discrimination, it restricted membership to people of "Caucasian origin". After a vote by members in a February 2010 extraordinary general meeting the party dropped this policy, with chairman Nick Griffin saying that the party will now "accept anyone as a member providing they agree with us that this country should remain fundamentally British". The party does not regard non-white people as being British, even if they have been born in the UK and are naturalised British citizens. Instead, Griffin has stated that "non-Europeans who stay", while protected by British law, "will be regarded as permanent guests."
The party has stated that it does not consider the Jewish, Hindu or Sikh religions to have a significantly detrimental or threatening effect, having several members with Jewish ancestry, but does not accept practising Sikhs or Hindus as culturally or ethnically British. In pursuit of the policy, the BNP has previously worked with extremists from the Sikh and Hindu communities in an anti-Islamic campaign and actively tried to win Jewish votes.
The BNP is opposed to mixed-race relationships on the stated ground that racial differences must be preserved; the party said that "when whites take partners from other ethnic groups, a white family line that stretches back into deep pre-history is destroyed."[135] Nick Griffin stated: "...while the BNP is not racist, it must not become multi-racist either. Our fundamental determination to secure a future for white children is restated, and an area of uncertainty is addressed and a position which is both principled and politically realistic is firmly established. We don't hate anyone, especially the mixed race children who are the most tragic victims of enforced multi-racism, but that does not mean that we accept miscegenation as moral or normal. We do not and we never will."