Selby and Ainsty MP Keir Mather to be sworn in to House of Commons
By Kevin Shoesmith and PA Media
BBC News
Labour's Keir Mather will become the youngest MP in the Commons when he is sworn in later.
Aged 25, he overturned a 20,137 Conservative majority to win the North Yorkshire seat of Selby and Ainsty for Labour in July's by-election.
The Hull-born politician has been nicknamed "baby of the House".
Mr Mather is one of three new MPs who will take their seats on the green benches as Parliament returns after the summer recess.
Welcoming the Oxford University graduate, shadow education secretary Bridget Phillipson said: "I'm delighted that Keir will be joining us in Parliament, making the case for the people of Selby and Ainsty."