In the wake of Thursday's crunch by-election results, Jack Blanchard considers why Britain always seems to turn against even its most popular prime ministers in the end.

The Atlantic's Tom McTague and pollster James Johnson discuss the collapse in Boris Johnson's popularity, and whether it's still possible for him to turn things around.

And former Downing Street officials Caroline Slocock, Jon Ashworth, Paul Harrison and John McTernan explain how it all went wrong for past leaders such as Margaret Thatcher, Tony Blair, Gordon Brown and Theresa May. 

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