UKIP have stated that they will not contest seats with euro-skeptic conservative MPs. But even if they do contest them, you have to remember that most seats in a general election the total vote of all other parties combined does not equal the winning candidate's. The incumbent party will win in that seat nearly every time, some seats have remained politically static for centuries.

Only 100 - 150 seats are really in play with perhaps half that number changing hands, and in such circumstances people like their vote to count and so will not vote for marginal parties.

keep to the Fen Causeway