From the manifesto, this should answer your question:

11. While accepting the right of law-abiding minorities, in our country because they or their ancestors came here legally, to remain here and to enjoy the full protection of the law against any form of harassment or hostility, we will also seek to emphasise the importance of the prior status of the aboriginal people. This would be a national extension of the 'Sons and Daughters' policy in priority on housing and school places lists which BNP councils seek to implement at local level.