Heidi Alexander stands for public control of transport, stronger local government powers and an interventionist state, but she is not from Labour's Corbynite left. She backed Andy Burnham for the Labour leadership, chaired Sadiq Khan's campaign to become Labour's London mayoral candidate and later supported Owen Smith's challenge to Jeremy Corbyn. She was the first shadow cabinet minister to resign during the 2016 revolt against Corbyn, whose operation she called "entirely dysfunctional".

Her strongest record is in public transport. As Sadiq Khan's deputy mayor, Alexander helped implement the 2021 expansion of London's Ultra Low Emission Zone. City Hall's subsequent assessment estimated that roadside nitrogen dioxide in inner London was 21 per cent lower than it would have been without the scheme. The policy was Khan's and had been developed before Alexander took the job, but she was involved in turning it into an operating system.

She also inherited the troubled Crossrail project. Alexander chaired the committee created after control was brought more firmly inside Transport for London, improving public oversight of the work. She did not deliver the completed Elizabeth line. She left City Hall before it opened, after further delays and demands for additional public money. Her contribution was to repair part of the project's management, not to finish it.

As transport secretary, Alexander oversaw the transfer of South Western Railway, c2c and Greater Anglia into public ownership. She implemented the change, but did not originate it: the enabling legislation received royal assent the day before she was appointed. She also took the Railways Bill through the Commons and backed the Bus Services Act, which made it easier for local authorities to franchise services or establish their own bus companies. These were substantial structural changes, although neither passing legislation nor changing an operator's owner automatically improved the service passengers received.

Rail performance improved only marginally during her time at the department. Punctuality and cancellations moved in the right direction, but by small amounts, and the figures covered the whole network, including private operators. Alexander and the nationalisation programme cannot claim all the credit.

Her clearest failure was the driving-test backlog. Alexander announced measures intended to reduce average waits to seven weeks by summer 2026. The deadline passed with the average still close to 22 weeks. More tests were provided and additional examiners recruited, but the promised result was not delivered.

Her handling of HS2 showed a willingness to admit how badly the project had been managed. She replaced senior leadership, published critical assessments and abandoned the previous timetable. That was more honest than pretending the existing plan remained achievable. It did not amount to getting the project under control. By March 2026, £46.8 billion had been spent, another reset was costing £153 million and only 45 of 124 accepted review recommendations had been implemented.

Alexander has also shown that she places infrastructure growth above some environmental objections. She approved the expansion of Luton Airport after planning inspectors recommended refusal and authorised Gatwick's second-runway scheme. Supporters pointed to investment and jobs. Critics argued that the additional flights, pollution and noise were incompatible with the government's climate promises. The decisions were hers, and she cannot dismiss their consequences as inherited policy.

The record suggests that Alexander is an experienced administrator who can implement complicated policies and make difficult decisions. It does not show that she can reliably rescue failing programmes. Public ownership and new legislation moved forward under her. Crossrail opened after she had gone, the driving-test target was missed and HS2 remained financially unstable. She appears capable at operating government machinery. The evidence for transforming services that are already failing is much weaker.