If Labour can turn its fiasco of a leadership election into a voter registration drive, it can push back against a rigged system.
Labour, UKIP and the Greens all gained much bigger swings than the Conservatives, but were election losers. The first-past-the-post system let the Tories pick up a swag of seats with a 0.8% swing.
This week the "mother of parliaments" faces a general election in the UK. The 'first past the post' electoral system means we can't predict the result with certainty, nor expect it to match the vote.