Ahead of Dominic Cummings' appearance at the Science and Technology Select Committee on Wednesday, Matt Chorley speaks finds out what select committees do, and why they're so important, with author of How To Survive A Select Committee Scott Colvin, Times Diary Editor Patrick Kidd and Labour MP Sioban McDonagh.

PLUS

Rachel Sylvester and Libby Purves discuss the BBC, Martin Bashir and education.

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