MP for Ealing Southall
Government Whip, Lord Commissioner of HM Treasury
“A party-loyal Labour (Co-op) MP and Government Whip who rarely rebels but has unusually low voting attendance.”
Deirdre Costigan is the Labour (Co-op) MP for Ealing Southall, elected in July 2024. She currently serves as Government Whip (Lord Commissioner of the Treasury) and sits on several committees, including the Committee of Selection and the representations around the Representation of the People Bill and Rare Cancers Bill, having previously served as an Assistant Whip and on the Health and Social Care Committee.
Her voting pattern shows 100% party loyalty with no rebel votes, though she has a notably low attendance rate of 17%. She generally votes in favour of workers’ rights protections, trade union powers, bus services regulation and protest rights, while voting against transgender rights, against publicly owned rail, and against tougher prison sentencing; her votes on Universal Credit and mental health services are mixed.
One declared financial interest: gifts, benefits and hospitality from UK sources.
Generated 21 February 2026
How this MP participates in parliamentary votes. These numbers describe activity, not effectiveness.
How often this MP votes
Labour (Co-op) average: 34%
The percentage of parliamentary votes (divisions) this MP participated in. MPs may miss votes for legitimate reasons including ministerial duties, constituency work, or illness.
How often this MP votes with their party
Labour (Co-op) average: 99%
Estimated from voting record, not self-declared. This is a simplified model — real politics is more complex than a single axis.
8 positions
Committee of Selection
Since May 2026
Government Whip, Lord Commissioner of HM Treasury
Since May 2026
Representation of the People Bill
Since Mar 2026
Rare Cancers Bill
Since Jun 2025
English Devolution and Community Empowerment Bill
Sept 2025 - Oct 2025
Assistant Whip
Sept 2025 - May 2026
Non-Domestic Rating (Multipliers and Private Schools) Bill
Dec 2024 - Dec 2024
Health and Social Care Committee
Oct 2024 - Mar 2025
Figures include only interests with declared monetary values from the Register of Members' Financial Interests. Some categories (e.g. hospitality, overseas visits) may not have monetary values recorded, so the total may not reflect all declared interests.
Draft Agriculture (Delinked Payments) (Reductions) (England) Regulations 2026
AYEArmed Forces Bill Committee: New Clause 13
NOArmed Forces Bill
Armed Forces Bill Committee: New Clause 6
NOArmed Forces Bill
Armed Forces Bill Committee: New Clause 5
NOArmed Forces Bill
Armed Forces Bill Committee: New Clause 2
NOArmed Forces Bill
Steel Industry (Nationalisation) Bill: Reasoned Amendment to Second Reading
NOSteel Industry (Nationalisation) Bill
King's Speech Motion for an Address
AYEKing's Speech Motion for an Address: amendment (p)
NOKing's Speech Motion for an Address: amendment (l)
NOKing's Speech Motion for an Address: amendment (o)
NOKing's Speech Motion for an Address: amendment (i)
NOCommittee of Selection
Parliamentary role · 18 May 2026
Government Whip, Lord Commissioner of HM Treasury
Government role · 12 May 2026
Children's School and Wellbeing Bill: Motion relating to Lords Amendments 38V to 38X
AYENorthern Ireland Troubles Bill: Carry-over (Motion)
AYENorthern Ireland Troubles Bill
The percentage of votes where this MP voted the same way as the majority of their party. High loyalty is typical; most MPs vote with their party on most issues.
Rebel votes
Times this MP voted differently from the majority of their party. This can reflect independent judgement, but context matters — some rebel votes are on procedural matters, others on major policy.
