Deirdre Costigan.

A near-perfect Labour loyalist with one notable exception, Costigan broke ranks in December 2024 to act as a teller for a motion to clear the public gallery — a procedural oddity that put her on the wrong side of her party, and of the 49 MPs who voted to keep proceedings open. Beyond that single deviation, she has voted with Labour in 99.8% of divisions, backing the government's position on defence spending, the phase-out of direct farm subsidies, and opposing opposition amendments to the Armed Forces Bill throughout June 2026. On assisted dying she sits noticeably to the left of her parliamentary colleagues — 31 points more supportive of access than the Labour average — and her stance profile flags very low alignment with parliamentary scrutiny, civil liberties, and local democracy measures.

At 91% voting participation, Costigan is an engaged presence in the chamber, above the Commons average. Her 185 contributions across 114 debates cluster heavily around economy and jobs, social care, fiscal policy, and cost of living — a pattern consistent with her Ealing Southall constituency, one of London's more economically diverse seats. She holds no select committee place. Her news footprint over the past 90 days runs across 82 articles, dominated by crime and local government coverage, with broadly neutral sentiment — though she drew negative press in April 2025 when striking traffic wardens accused her of ignoring calls for support after previously championing their cause.

On housing she has been the more visible advocate: pressing the leasehold management firm FirstPort in parliament, welcoming homelessness funding, and backing the Renters' Rights Bill. Speech data cuts off at December 2025 and committee data shows no current membership, limiting the picture of her more recent parliamentary work.