Reply #9: I don't think the "other" seats go to the British National Party. I think they go mainly to

[StevieM]

the Scottish and Welsh nationalist parties, along with various parties in Northern Ireland (one of whom runs, and then refuses its seats). The Protestant seats in N. Ireland and generally held by people and parties who are likely to join with Conservatives, as they did in 1992 to sustain John Major.

Steve