Parliament welcomes three new MPs as two by-elections triggered

Labour’s Keir Mather is the new youngest MP in the Commons.

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Houses of Parliament

Sir Lindsay Hoyle joked there are “too many Keirs” as the youngest MP took his seat in the House of Commons alongside two other newcomers.

The Commons Speaker made the quip after Labour’s Keir Mather swore the oath of allegiance to the King as Parliament returned from its summer recess on Monday.

At 25, Mr Mather is now the youngest MP in the Commons – the Baby of the House – after overturning a 20,137 Conservative majority to win the North Yorkshire seat of Selby and Ainsty for Sir Keir Starmer’s party.

Selby by-election
Keir Mather (centre) with Labour leader Sir Keir Starmer and Angela Rayner following his election win (Stefan Rousseau/PA)