MP for Mitcham and Morden
“A long-serving, party-loyal Labour Co-op MP who plays a key role on the Treasury Committee and has shown independence on end-of-life legislation.”
Dame Siobhain McDonagh is a long-serving Labour Co-op MP for Mitcham and Morden, first elected in 1997. She sits on the Treasury Committee and the Panel of Chairs, and since 2025 has been part of the Rare Cancers Bill committee, reflecting a focus on financial oversight and health policy. Throughout her parliamentary career she has also served on education and equality committees, showing a broad policy background.
She has very high party loyalty (99%) and attends votes above her party’s average (53% vs 33%). Her voting record generally supports NHS funding and trade union powers, while she tends to oppose tightening immigration controls and the Rwanda deportation scheme; she has a mixed pattern on VAT, transgender rights and prison sentencing. She has 10 rebel votes against her party, including notable splits on End of Life amendments in 2025.
Declared financial interests include gifts, benefits and hospitality from UK sources (1 entry).
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: 33%
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.
16 positions
Rare Cancers Bill
Since Jun 2025
Treasury Committee
Since Oct 2024
Panel of Chairs
Since Jul 2024
Finance Bill
Jan 2024 - Jan 2024
Renters (Reform) Bill
Nov 2023 - Nov 2023
Social Housing (Regulation) Bill [HL]
Nov 2022 - Nov 2022
Financial Services and Markets Bill
Oct 2022 - Nov 2022
Treasury Sub-Committee on Financial Services Regulations
Jun 2022 - May 2024
Treasury Committee
May 2020 - May 2024
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.
Victims and Courts Bill: motion to disagree with Lords Amendment 6
AYEVictims and Courts Bill
Victims and Courts Bill: motion to disagree with Lords Amendment 5
AYEVictims and Courts Bill
Victims and Courts Bill: motion to disagree with Lords Amendment 4
AYEVictims and Courts Bill
Victims and Courts Bill: motion to disagree with Lords Amendment 2
AYEVictims and Courts Bill
Victims and Courts Bill: motion to disagree with Lords Amendment 1
AYEVictims and Courts Bill
Opposition Day Motion: Defence
NOOpposition Day Motion: Oil and Gas
NONational Insurance Contributions (Employer Pensions Contributions) Bill: motion to disagree with Lords Amendment 6
AYENational Insurance Contributions (Employer Pensions Contributions) Bill
National Insurance Contributions (Employer Pensions Contributions) Bill: motion to disagree with Lords Amendment 5
AYENational Insurance Contributions (Employer Pensions Contributions) Bill
National Insurance Contributions (Employer Pensions Contributions) Bill: motion to disagree with Lords Amendment 3
AYENational Insurance Contributions (Employer Pensions Contributions) Bill
National Insurance Contributions (Employer Pensions Contributions) Bill: motion to disagree with Lords Amendment 2
AYENational Insurance Contributions (Employer Pensions Contributions) Bill
National Insurance Contributions (Employer Pensions Contributions) Bill: motion to disagree with Lords Amendment 1
AYENational Insurance Contributions (Employer Pensions Contributions) Bill
Opposition day motion: fuel duty
NOFinance (No. 2) Bill: Third Reading
AYEFinance (No. 2) Bill
Finance (No. 2) Bill Report Stage: Amendment 6
NOFinance (No. 2) 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.
