MP for Mitcham and Morden
“A long-serving Labour MP and Treasury Committee member with very high party loyalty, who has shown occasional rebellion on terminally ill end-of-life amendments.”
Dame Siobhain McDonagh has served as the Labour and Co-operative MP for Mitcham and Morden since 1997. She currently sits on the Treasury Committee and the Panel of Chairs, and since 2025 has been a member of the Rare Cancers Bill committee. Her long parliamentary career has included a focus on finance, housing, education and equality through a range of committees.
Her voting record is largely party-aligned, with a 99% party loyalty score and attendance above the party average. She tends to back public services and workers' rights (NHS funding, bus services regulation, and trade union powers) while opposing tighter immigration controls and the Rwanda deportation scheme; her votes on Universal Credit, VAT, transgender rights and prison sentencing show a mix rather than a fixed line.
Declared financial interests include one entry for 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.
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.
Railways Bill: Third Reading
AYERailways Bill
Railways Bill Remaining Stages: Amendment 148
NORailways Bill
Railways Bill Remaining Stages: Amendment 143
NORailways Bill
Railways Bill Remaining Stages: New Clause 1
NORailways Bill
Draft Combined Authorities (Mayoral Elections) (Amendment) Order 2026
AYESteel Industry (Nationalisation) Bill Committee: New Clause 4
NOSteel Industry (Nationalisation) Bill
Steel Industry (Nationalisation) Bill Committee: New Clause 12
NOSteel Industry (Nationalisation) Bill
Steel Industry (Nationalisation) Bill Committee: Amendment 20
NOSteel Industry (Nationalisation) Bill
Steel Industry (Nationalisation) Bill: Reasoned Amendment to Second Reading
NOSteel Industry (Nationalisation) Bill
Draft Immigration and Asylum (Provision of Accommodation to Failed Asylum-Seekers) (Amendment) Regulations 2026
AYEDraft Asylum Seekers (Reception Conditions) (Amendment) Regulations 2026
AYEPension Schemes Bill: Government Motion relating to Lords Reason 88X
AYECollective Defined Contribution Pension Schemes Bill
Privilege
NOChildren'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.
