Deirdre Costigan's record is that of a trade-union Labour politician who moved quickly from local government into the machinery of national government. She has clear positions on workers' rights, disability equality and climate policy. What she lacks, after two years in Parliament, is a substantial reform that can be credited directly to her.

How she rose

Costigan's route into Parliament ran through Ealing Council. As deputy leader and cabinet member for climate action, she gained responsibility for transport, air quality and the borough's net-zero programme. When Virendra Sharma retired shortly before the 2024 election, Labour selected Costigan for the safe Ealing Southall seat. Sharma and council leader Peter Mason both supported her.

Her rise at Westminster was unusually quick. Keir Starmer made her an assistant government whip in September 2025 and promoted her again in May 2026. Whips do not normally design policy. Their job is to secure votes, assess discontent and keep government business moving. The appointments therefore showed that Starmer's operation considered Costigan dependable, but they gave her little opportunity to establish an independent ministerial record.

Her time in the whips' office ended when Andy Burnham formed his government in July 2026. She was moved to a parliamentary private secretary position in the business department. The change kept her close to government while reducing her formal authority.

What she actually delivered

Costigan's most tangible work was done at Ealing Council. She was involved in bringing parking enforcement back under council control from Serco in April 2024. The service transferred to the council-owned Greener Ealing company, employed 20 additional enforcement officers and introduced later patrols. The council said the change would give it greater control over service quality while supporting safer streets and better enforcement of pavement and cycle-lane parking.

That was a completed organisational change, although its aftermath was untidy. Parking officers later took industrial action over pay and conditions, arguing that they were being treated less favourably than directly employed council staff. Bringing a service back under public control matched Costigan's trade-union politics. It did not remove the need to settle how its workforce would be treated.

She also approved Ealing's 2022-27 air-quality plan and oversaw parts of its wider climate strategy. Government figures showed that territorial carbon emissions per resident in Ealing had fallen by around half between 2005 and 2021. That long-term reduction covered many years before Costigan held the portfolio and was affected by national changes, so it cannot be claimed as her achievement alone.

Her administration also made a politically awkward retreat. Seven low-traffic neighbourhoods were removed in 2021 after local consultations. Costigan defended the principle of reducing congestion but accepted that schemes lacking public support should not remain. Campaigners criticised the consultations as unrepresentative. The episode showed a preference for electoral consent over forcing through a transport policy in the face of organised opposition.

What she tried but did not deliver

Costigan's main independent parliamentary proposal concerned disabled workers. In May 2025 she introduced a bill requiring employers to respond to requests for reasonable adjustments within a fixed period. She argued that some disabled employees waited a year or received no answer at all, leaving them unable to work safely.

The proposal addressed a genuine gap in employment law. Employers must make reasonable adjustments, but there was no clear statutory deadline for replying to a request. Costigan's bill did not pass. It fell while awaiting its second reading, and the Employment Rights Act 2025 did not include the duty. A Commons committee later endorsed a two-week response deadline, but by July 2026 it was still not law.

Costigan supported the government's wider employment and renters' rights legislation, both of which became law. Those were collective manifesto measures developed and driven by ministers. Her support was consistent with her politics, but it is not evidence that she personally designed or secured them.

Political character and capability

Costigan sits firmly within Labour's union and local-government tradition. She favours stronger employment protection, public control of services and intervention to reduce inequality. Her climate politics are more pragmatic than absolute. She welcomed the employment and economic case for Heathrow expansion, while insisting that any scheme meet tests on noise, pollution and carbon. That placed jobs and growth alongside environmental protection rather than treating climate policy as an overriding veto.

She has also been notably loyal. Her rapid promotion into the whips' office came because she could be trusted to advance government policy, including measures that caused resistance elsewhere in the Parliamentary Labour Party. There is little evidence of her using that access to force a public concession from ministers.

The fairest assessment is that Costigan has demonstrated administrative competence and political discipline, particularly in local government. Bringing parking enforcement in-house was a real decision with visible consequences. Her disability proposal also showed that she could identify a practical defect in the law. But it failed to progress, and her Westminster roles were concerned with enforcing collective decisions rather than making them. By July 2026, she had shown promise and reliability, not a proven capacity to deliver major national policy.