McMahon made his name by taking control of a Labour group and council that had lost authority as well as money. After Oldham Labour was forced into opposition in 2008, he challenged its established leadership and helped negotiate a cross-party recovery plan. Labour returned to power in 2011 with McMahon as council leader.

His approach was practical and unsentimental. The leader’s car and credit card went, senior councillors’ allowances were cut by 10 per cent and councillors were required to undertake training before exercising some financial responsibilities. The council opened its meetings to online scrutiny and began pushing responsibility towards district-level bodies. These changes did not reverse Oldham’s economic decline, but they established McMahon as a municipal reformer prepared to confront his own party’s habits.

That reputation carried him into Parliament in 2015 and eventually into Keir Starmer’s shadow cabinet. He left the environment brief in 2023 while recovering from serious illness, returned in the less senior devolution post and became local government minister after Labour won power.

His position depended heavily on Labour’s municipal network. An ally of Angela Rayner, he lost his job when Starmer reshuffled the department after her resignation in September 2025. Andy Burnham returned him to the same department, at a lower ministerial rank, in July 2026. The comeback restored his access to government but, coming nine days before the cut-off date, produced no additional record of delivery.

What he stands for

McMahon’s politics grew from local government rather than Westminster theory. His “co-operative council” model combined a strong public sector with community ownership, neighbourhood decision-making and an expectation that residents should participate rather than simply receive services.

In government this became a programme for transferring power from Whitehall to mayors and larger strategic authorities. He also supported replacing England’s two-tier county and district system with fewer unitary councils, arguing that larger authorities would be more financially sustainable and easier to hold accountable.

This was not localism in the sense of preserving every existing council. McMahon was willing to impose restructuring from the centre to create the institutions he believed could exercise devolved power. He is a party operator, but not invariably silent once removed from office. When his successors delayed four planned mayoral elections until 2028, he accused the government of breaking the commitments made to those areas.

What he delivered

His most substantial national work was the English Devolution and Community Empowerment Bill, introduced jointly with Rayner in July 2025. It created the statutory category of strategic authorities and provided for stronger mayoral powers over transport, planning, housing and economic development. It also contained a community right to buy valued local assets, tighter controls over gambling premises and new scrutiny arrangements for mayoral authorities.

The Bill received Royal Assent in April 2026. McMahon had been out of government for almost eight months by then, so credit is shared with Rayner and the ministers who completed its passage. Nevertheless, he helped design and introduce a lasting legal framework. What it had not produced by July 2026 was evidence that devolution had improved services, growth or local accountability. The law was complete; most of its promised results were not yet measurable.

Record in Oldham

The gravest test of McMahon’s council leadership was child protection. A later independent review found that Oldham’s strategic response to child sexual exploitation had been ahead of many councils and that McMahon had sought to confront the problem. Under his administration, the council reduced its reliance on agency social workers, improved information-sharing and ran campaigns that encouraged victims and witnesses to come forward.

The same review found serious operational failures. Police and social services did not properly protect several children, including cases handled while McMahon led the council. It found no evidence that the Labour leadership covered up abuse for political advantage, but children were still abandoned by services for which the council shared responsibility. McMahon accepted those failures and acknowledged that victims had been let down.

Political character and capability

McMahon has proved himself an effective institutional politician. He can take control of a damaged organisation, negotiate across party lines and turn a political idea into legislation.

His weaknesses are equally clear. Oldham’s safeguarding record showed that strategic activity and favourable assessments did not guarantee protection on the ground. His devolution programme became law, but implementation slipped and elections were postponed during the reorganisation. In 2025 he approved one-year delays in nine council areas; after leaving office, he condemned further delays imposed by others.

The completed record supports his reputation as a capable council leader and policy architect. It offers less evidence that he consistently converts administrative reform into better outcomes for the people affected by it.