Mitcham and Morden.

One of Labour's longest-serving MPs, McDonagh has been most active recently on the assisted dying bill, where she broke from her party on five separate votes in June 2025. Her rebel positions clustered around safeguards -- she backed amendments to close the voluntary starvation loophole and supported procedural moves to allow further scrutiny -- placing her among those who wanted the legislation tightened rather than blocked outright. She also chairs the APPG for Brain Tumours, which secured a ministerial meeting in April 2026, and has used her role as chair of the APPG for Tamils to press the government on Sri Lankan war crimes, including the Chemmani mass graves.

McDonagh's participation rate of 60% sits below the Commons average, though her 28-year tenure and heavy committee load provide some context. At 95.8% party alignment she is broadly loyal, but her voting profile shows meaningful divergences: she is notably more supportive of assisted dying access and end-of-life autonomy than the Labour average, and scores 100% on welfare reform votes against a party average of 79%. She sits on the Treasury Committee and the Panel of Chairs, and her speech record -- 142 contributions across health, economy, social care and local government -- reflects a constituency focus rather than a national platform.

Beyond Westminster, she draws strong local coverage on housing and community issues. The highest-impact news items include praise for her constituency work -- one tribute called her "quite simply the best constituency MP in Parliament" -- though that piece dates from 2023. Recent 90-day coverage is mixed in sentiment and dominated by local government stories. Full voting data and committee transcripts are available; some Lords amendment votes lack published debate excerpts, limiting detail on a handful of recorded positions.