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UK politician

Deirdre Costigan
MP
Official portrait, 2024
Lord Commissioner of the Treasury
Incumbent
Assumed office
12 May 2026
Prime MinisterKeir Starmer
Member of Parliament
for Ealing Southall
Incumbent
Assumed office
4 July 2024
Preceded byVirendra Sharma
Majority15,793 (33.7%)
Member of Ealing London Borough Council for Northolt Mandeville
In office
3 May 2018 – 6 September 2024
Personal details
BornDeirdre Theresa Costigan
Dublin, Ireland
PartyLabour

Deirdre Theresa Costigan[1] is an Irish politician and trade unionist in the UK, who has been the Labour Party Member of Parliament (MP) for Ealing Southall in the United Kingdom House of Commons since 2024.[2]

Early career

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Costigan was born in Dublin, Ireland, and emigrated to London in the 1990s.[3] She was a shop steward for the trade union Unison. Before her election as an MP, she was Unison's national officer for disability equality.[4]

Political career

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In 2018, Costigan was elected as a Labour councillor for the Northolt Mandeville ward of Ealing London Borough Council. She was re-elected in 2022.[5] She served as deputy leader of the council for the three years preceding her election in 2024 as an MP.[6]

In the 2024 general election, Costigan was elected the Member of parliament (MP) for Ealing Southall with 23,000 votes (49.1%) and a majority of 15,793 over the second place Conservative candidate.[7] On 18 July 2024, she made her maiden speech during a debate on foreign affairs and defence.[4]

In the September 2025 cabinet reshuffle, Costigan was appointed to the ministerial position of assistant government whip.[8] On 12 May 2026, she was appointed junior lord of the treasury (government whip) following mass resignations from the government.[9]

Personal life

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Costigan is a lesbian.[10][11]

References

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  1. ↑ "Members Sworn". Parliamentary Debates (Hansard). Vol. 752. Parliament of the United Kingdom: House of Commons. 10 July 2024. Archived 2024-08-10 at the Wayback Machine
  2. ↑ "Ealing Southall – General election results 2024". BBC News. Archived from the original on 3 July 2024. Retrieved 5 July 2024.
  3. ↑ "Go west: Woman from west Dublin eyes west London seat in Westminster". The Irish Times. Retrieved 8 January 2025.
  4. 1 2 Deirdre Costigan (18 July 2024). "Foreign Affairs and Defence". Parliamentary Debates (Hansard). Vol. 752. United Kingdom: House of Commons. col. 224–226. Archived 2024-08-17 at the Wayback Machine
  5. ↑ "Councillor details – Councillor Deirdre Costigan". ealing.moderngov.co.uk. Ealing Council. 17 August 2024. Archived from the original on 17 August 2024. Retrieved 17 August 2024.
  6. ↑ Simons, Ben (10 July 2024). "New changes at Ealing Council following Deirdre Costigan becoming Ealing Southall MP". EALING NEWS. Archived from the original on 4 September 2024. Retrieved 17 August 2024.
  7. ↑ "General election results 2024: Ealing Southall". BBC News. Retrieved 17 August 2024.
  8. ↑ "Ministerial appointments: September 2025". Prime Minister's Office. 11 September 2025. Retrieved 12 September 2025 – via gov.uk.
  9. ↑ "Deirdre Costigan MP". GOV.UK. Retrieved 12 May 2026.
  10. ↑ "Contributions for Deirdre Costigan". Hansard. Retrieved 18 May 2025.
  11. ↑ "LGBT+ History Month Volume 762: debated on Thursday 13 February 2025". Hansard. Retrieved 18 May 2025. Thank you, Madam Deputy Speaker, for allowing me to speak, as a lesbian MP
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