In the third episode of this major four-part series, presenter Michael Cockerell sees how the traditional three-party system appears to be falling apart at the seams. Backbench MPs are becoming increasingly rebellious as they confront the dark arts of the whips - the shadowy figures who seek to impose party discipline. Michael follows Lib Dem MP Jenny Willott as she seeks to balance new parenthood with politics. And we follow the clockmakers whose job it is to ensure that all the Commons' 2,000 clocks, from Big Ben downwards, tell exactly the same time.

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