Labour’s Keir Mather is voice of youth, Lib Dem’s Sarah Dyke is from local farming family and Tory Steve Tuckwell won on Ulez issue

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When parliament returns in the autumn, it will have three new MPs, each of whom represents something unique about their party’s best chances of success at the next election.

For Labour, Keir Mather’s victory in Selby and Ainsty was evidence of the power of the “change” message it hopes to sell to voters next year. At 25 years old, Mather will become the “baby of the house”, having run on the campaign slogan of “a fresh start”.