Living overseas, I may be missing something here from a political angle. I assume the BNP is some right wing UK minority party. If that is the case, then I believe that this is not the forum in which to peddle its wares.
However, the words, construction and sentiment of the song/poem strike a bell with me. OK, the reference to housing for Iraqis and Afghans certainly gives it a racist slant, but I'm sure that this song is good enough to deserve a wider currency.
Maybe a re-write of this verse might make it more palletable, unless, of course, the author is deliberately trying to stir up BNP sympathies. On the other hand, maybe he is telling it "like it is" without actually pushing any political barrow.
I have not previously heard of Nick Griffin, but if this song is typical of his material, I would like to see and hear more.
Signing off to go Googling....