Sir Mark Tami has been Labour MP for Alyn and Deeside since 2001, when he succeeded Barry Jones, who had held the seat for 31 years; between them, two Labour MPs have represented the area for 55 years. Born in Enfield, north London in October 1962 and a History graduate of the University of Wales, Swansea, he was National Head of Policy at the union Amicus (formerly the AEEU) before Parliament. A London born, Swansea educated history graduate representing a north east Wales seat for 24 years is a more specific trajectory than "trade union movement" alone conveys.

His career has been almost entirely in party management. He was PPS to Dawn Primarolo, the Paymaster General, from 2005, but resigned in September 2006 in protest at Tony Blair's refusal to set a departure date, a defiance that cost him his Treasury position and returned him to the backbenches. He then served as an Assistant Government Whip under Gordon Brown, as Opposition Pairing Whip for 13 years from 2010 under four leaders, as Opposition Deputy Chief Whip from 2023, and since July 2024 as Treasurer of His Majesty's Household, the Deputy Chief Whip role, on which appointment he was knighted.

In 2024 he was re-elected with a majority of 8,794 (20.3 percent), a striking recovery from the 213 votes by which he survived in 2019, one of the largest personal turnarounds of any returning Labour MP. In 2009 he was reported to have overclaimed council tax on a London home and repaid £996.70, a small sum consistent with the broader expenses scandal rather than evidence of systematic misconduct.

Tami's strengths include a Swansea History degree, the National Head of Policy role at Amicus, 24 years of continuous representation, the 2006 Primarolo resignation showing a capacity for defiance, 13 years as opposition pairing whip giving him deep institutional memory, the Deputy Chief Whip role in government, the knighthood, the recovery from a 213 to an 8,794 majority, and the fact that only two Labour MPs have held the seat in 55 years. His weaknesses include being born in London rather than Wales, no ministerial office outside the whip roles, no legislative achievement, no select committee service, the £996.70 expenses repayment, and a career defined by party management rather than policy substance. At 63, the Deputy Chief Whip role is the peak of his career. Whether that matters to Alyn and Deeside voters or only to Labour whips is the question his 24 year record leaves unanswered.