CARLISLE, ENGLAND — Sylvia Hodges has not yet decided how to cast her vote in elections next month to the European Parliament, but she knows who she won’t support.

“Certainly not Labor or the Conservatives,” said Ms. Hodges, a 76-year-old retired office worker, referring to the two main parties in Britain, whose representatives in Parliament have been engulfed in a scandal over their expense accounts.

“It’s disgusting for them to stand there and say they have done nothing wrong,” she said, standing on the doorstep of her home in a neat row of houses in this city not far from the border of Scotland.

Ms. Hodges is so angry with London politicians that she is considering a vote for the far-right British National Party, one of several smaller parties hoping to capitalize on an extraordinary tide of discontent with established leaders.