21.   They face a mountain of paperwork designed for the main parties.

22.   They have formed successive alliances with the two main parties of left and right, using their position to maintain continuity.

23.   They reasoned that, if neither main party won a commanding majority, both would have a stake in negotiating rather than fighting.

24.   Unless the two main parties can agree on a successor a contest seems inevitable.

25.   Voters have a choice between three main political parties.

26.   What makes the situation in Britain today so worrying is that the leaders of both main parties agree on virtually everything.

27.   Opinion polls show the two main parties are running neck and neck.

28.   The movement is supported by key figures in the three main political parties.