"I'm an LAS employee and I think I may vote for the BNP" shouldn't really have any more weight than "I may vote for the Conservative Party/Labour Party/Legalise Cannabis Alliance/Monster Raving Loony Party." I mean, the BNP is a perfectly legal political party. The LAS may have rules about declaring one's political leanings while wearing the uniform (so to speak) but I don't believe an employer could actually say "while working for us, you may openly support A, B or C political party but NOT Party D or Party E." The problem would be if they said "I'm an LAS employee and I wish I didn't have to treat those black bastards, I try not to take them to hospital, after all they don't have any right to the NHS..."