The key seats that will decide the general election

Sean O'Grady looks at the constituencies that could make or break the election

A Labour gain in Theresa Villiers' Chipping Barnet seat could mean curtains for Boris Johnson’s premiership (Getty)

With the Remain alliance, the Brexit Party’s decision to stand only in non-Tory seats and any number of knife-edge marginals, there’s plenty of constituencies to look out for as polling day approaches. These are some of the ones to watch – both during the rest of the campaign and on the night.

Chipping Barnet

This is held by Theresa Villiers for the Conservatives, with a majority of 353, or 0.3 per cent, over the challenging Labour Party. This is the seat that will deprive Boris Johnson of his premiership – a Tory loss of four seats that would mean they would be outnumbered by the other Remain parties. In effect, a Labour gain here – making certain heroic assumptions about a uniform swing around the rest of the country – would make Jeremy Corbyn prime minister.