Here's why politicians keep ducking the decision to expand London's airports

An anti-airport protest in Westminster last October. Image: Chris Ratcliffe/Getty.

It is 13 years since the then transport secretary Alistair Darling published a white paper supporting a third runway at Heathrow. Ever since, senior figures in both main parties have argued for aviation expansion. But politics has prevented a decision.

The last Labour government approved the construction of a third runway (nearly leading to the resignation of Ed Miliband from the cabinet), but the coalition cancelled the project when it entered office. Six months before becoming prime minister, David Cameron, with an eye to must-win marginals, declared: "The third runway at Heathrow is not going ahead: no ifs, no buts". It was a promise, not least after witnessing the damage that Nick Clegg endured over tuition fees, that he was not prepared to break. But Cameron, in common with George Osborne, continued to regard another runway, at Heathrow or elsewhere, as essential. 

The Airports Commission, established in September 2012, was designed to provide political cover for a decision. By deferring its recommendation until after the general election, it ensured Cameron avoided breaking his pledge (which was not repeated in 2015) and prevented aviation becoming a campaign issue.

In July, the commission endorsed a third runway at Heathrow and the government promised to respond by Christmas. But that decision has once again been delayed


Cameron would likely cite concerns over air quality as justification for the postponement – but it is his political motives that are clearest. The Conservatives' London mayoral candidate, Zac Goldsmith, is an implacable opponent of a third runway and has vowed to resign as an MP if the project is approved. By delaying a decision until after the mayoral contest in May 2016, Cameron could avoid a dramatic split with the environmentalist (though sources say Goldsmith is still prepared to resign if the prime minister backs Heathrow with pre-conditions). International Development secretary Justine Greening is another third runway opponent, and has not ruled out leaving the cabinet over the issue.  

Some in Labour would like to attack the government for its epic procrastination. In July, as acting leader, Harriet Harman told Cameron that her party would vote in favour of a third runway if he brought forward legislation. But the election of Jeremy Corbyn means Labour is now even more divided than the Tories over the project. Corbyn has publicly rejected a third runway, while John McDonnell, whose Hayes and Harlington constituency lies under the flight path, is perhaps its most vehement opponent. In 2009, he was suspended from the Commons after picking up the mace in protest at the government's decision. Corbyn and McDonnell are joined in opposition by Labour's London mayoral candidate Sadiq Khan. 

But with some frontbenchers, such as former shadow transport secretary Michael Dugher (now shadow culture secretary) in favour, a free vote, as in the case of Syria, could be required. Almost 30 northern Labour MPs and nine in London, including former mayoral candidates David Lammy and Gareth Thomas, support a third runway and have appealed to shadow transport secretary Lillian Greenwood to endorse the project. They are backed by the GMB and Unite unions, which, as on Trident, are at odds with the leadership on this issue. For Corbyn, as much as Cameron, then, there is every incentive to at least delay a divisive decision until the new year. 

George Eaton is political editor of our sister title, the New Statesman, where this article was originally published.

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Coming soon: CityMetric will relaunch as City Monitor, a new publication dedicated to the future of cities

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Later this month, CityMetric will be relaunching with an entirely new look and identity, as well as an expanded editorial mission. We’ll become City Monitor, a name that reflects both a ramping up of our ambitions as well as our membership in a network of like-minded publications coming soon from New Statesman Media Group. We can’t wait to share the new website with you, but in the meantime, here’s what CityMetric readers should know about what to expect from this exciting transition.  

Regular CityMetric readers may have already noticed a few changes around here since the spring. CityMetric’s beloved founding editor, Jonn Elledge, has moved on to some new adventures, and a new team has formed to take the site into the future. It’s led by yours truly – I’m Sommer Mathis, the editor-in-chief of City Monitor. Hello!

My background includes having served as the founding editor of CityLab, editor-in-chief of Atlas Obscura, and editor-in-chief of DCist, a local news publication in the District of Columbia. I’ve been reporting on and writing about cities in one way or another for the past 15 years. To me, there is no more important story in the world right now than how cities are changing and adapting to an increasingly challenging global landscape. The majority of the world’s population lives in cities, and if we’re ever going to be able to tackle the most pressing issues currently facing our planet – the climate emergency, rising inequality, the Covid-19 pandemic ­­­– cities are going to have to lead the way.

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The City Monitor team is made up of some of the most experienced urban policy journalists in the world. Our managing editor is Adam Sneed, also a CityLab alum where he served as a senior associate editor. Before that he was a technology reporter at Politico. Allison Arieff is City Monitor’s senior editor. She was previously editorial director of the urban planning and policy think tank SPUR, as well as a contributing columnist for The New York Times. Staff writer Jake Blumgart most recently covered development, housing, and politics for WHYY, the local public radio station in Philadelphia. And our data reporter is Alexandra Kanik, whose previous roles include data reporting for Louisville Public Media in Kentucky and PublicSource in Pittsburgh, Pennsylvania.

Our team will continue to grow in the coming weeks, and we’ll also be collaborating closely with our editorial colleagues across New Statesman Media Group. In fact, we’re launching a whole network of new publications this fall, covering topics such as the clean energy transition, foreign direct investment, technology, banks and more. Many of these sectors will frequently overlap with our cities coverage, and a key part of our plan is make the most of the expertise that all of these newsrooms combined will bring to bear on our journalism.

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Sommer Mathis is editor-in-chief of City Monitor.