While I understand the aversion most posters here have for the BNP, I am saddened by the call for official government repression against them that seems to have become the hallmark of this thread.
It is unthinkable to me that the state mail service would not punish mail carriers for failing to carry fully paid mail for political reasons. That is government acquisence to political censorship and nothing more, and I find it a supreme act of cowardice.
Want to be a "brave hero" against this tiny party you dislike? Contermail flyers of your own, start a counter-campaign, shore up support for a rival party. But don't turn to censorship.