I dont really know their motives but it does seem a success for the BNP.
However how to address the problem of why people support the BNP is not easy as possibly unsuccessful people wish to blame someone for their position and the BNP come up with the answer it is the fault of the immigration.
The problem of immigration may have been caused by the true British as Griffin likes to call them in the 19th and 20th Century plundering large areas of Asia ans Africa and because of a perceived guilt we have let in too many immigrants.
In a time of a prosperity it is not a major problem but in a time of reccession it is.