Lord Ashcroft's marginals poll gives Labour and the Lib Dems reasons to be cheerful

Labour has a 14-point lead in the 32 most marginal Tory-Labour seats, while the Lib Dems are just three points behind the Conservatives in the eight most competitive Tory-Lib Dem seats.

After the return of economic growth and the narrowing of Labour's poll lead prompted some Tories to talk of a "glide path to victory", Lord Ashcroft's marginals poll has provided a much-needed dose of realism. The survey of the Conservatives' 40 most vulnerable constituencies shows that the defection of Tory supporters to UKIP means that Labour now enjoys a 14-point lead in the 32 seats where it is in second place, compared to a national lead of just five in Ashcroft's poll. In short, the party is gaining support where it matters most. Labour is on 43% (down one since 2011), the Tories are on 29% (down six), UKIP is on 11% and the Lib Dems are on 8%. That lead is large enough for Miliband's party to win the 32 most competitive Con-Lab marginals and a further 66 off the Tories if the swing is replicated elsewhere, putting it on course for a comfortable majority.

But it isn't just Labour and UKIP that have cause to be cheerful; there's also some rare good news for the Lib Dems. In the eight most marginal Con-Lib Dem seats, Nick Clegg's party is just three points behind David Cameron's, with a swing of only 0.5% to the Tories since 2010. The Conservatives are on 32%, with the Lib Dems on 29%, Labour on 18% and UKIP on 12%. For the Lib Dems, it is further evidence that their vote is holding up where they are competitive. Rather than merely defending their existing 57 seats, the surge of UKIP (which draws around 60% of its support from 2010 Tories) means that the Lib Dems could yet hope to dislodge the Tories in seats where they are vulnerable.

The poll will gladden Labour hearts and darken Tory ones but it's important to remember, as Ashcroft says, that it is "a snapshot", not a prediction. It tells us what would happen were a general election held today, not what is likely to happen in 2015. Governments invariably gain support in the run-up to a general election as voters stop treating opinion polls as a referendum on the government (2010 was typical of this), so Labour needs a large cushion of support to be confident of victory. A similar poll conducted by PoliticsHome in September 2008 suggested the Conservatives would win a landslide majority of 146 seats, while another, carried out in October 2009, pointed to a Tory majority of 70. Just seven months later, Cameron was left with no majority at all. In other words, 18 months out from the general election, only the most optimistic Labourite or the most pessimistic Tory would treat this poll as a reliable indicator of the result.

David Cameron, Ed Miliband and Nick Clegg attend a ceremony at Buckingham Palace to mark the Duke of Edinburgh's 90th birthday on June 30, 2011. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

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The deafening killer - why noise will be the next great pollution scandal

A growing body of evidence shows that noise can have serious health impacts too. 

Our cities are being poisoned by a toxin that surrounds us day and night. It eats away at our brains, hurts our hearts, clutches at our sleep, and gnaws at the quality of our daily lives.

Hardly a silent killer, it gets short shrift compared to the well-publicised terrors of air pollution and sugars food. It is the dull, thumping, stultifying drum-beat of perpetual noise.

The score that accompanies city life is brutal and constant. It disrupts the everyday: The coffee break ruined by the screech of a line of double decker buses braking at the lights. The lawyer’s conference call broken by drilling as she makes her way to the office. The writer’s struggle to find a quiet corner to pen his latest article.

For city-dwellers, it’s all-consuming and impossible to avoid. Construction, traffic, the whirring of machinery, the neighbour’s stereo. Even at home, the beeps and buzzes made by washing machines, fridges, and phones all serve to distract and unsettle.

But the never-ending noisiness of city life is far more than a problem of aesthetics. A growing body of evidence shows that noise can have serious health impacts too. Recent studies have linked noise pollution to hearing loss, sleep deprivation, hypertension, heart disease, brain development, and even increased risk of dementia.

One research team compared families living on different stories of the same building in Manhattan to isolate the impact of noise on health and education. They found children in lower, noisier floors were worse at reading than their higher-up peers, an effect that was most pronounced for children who had lived in the building for longest.

Those studies have been replicated for the impact of aircraft noise with similar results. Not only does noise cause higher blood pressure and worsens quality of sleep, it also stymies pupils trying to concentrate in class.

As with many forms of pollution, the poorest are typically the hardest hit. The worst-off in any city often live by busy roads in poorly-insulated houses or flats, cheek by jowl with packed-in neighbours.

The US Department of Transport recently mapped road and aircraft noise across the United States. Predictably, the loudest areas overlapped with some of the country’s most deprived. Those included the south side of Atlanta and the lowest-income areas of LA and Seattle.

Yet as noise pollution grows in line with road and air traffic and rising urban density, public policy has turned a blind eye.

Council noise response services, formally a 24-hour defence against neighbourly disputes, have fallen victim to local government cuts. Decisions on airport expansion and road development pay scant regard to their audible impact. Political platforms remain silent on the loudest poison.

This is odd at a time when we have never had more tools at our disposal to deal with the issue. Electric Vehicles are practically noise-less, yet noise rarely features in the arguments for their adoption. Just replacing today’s bus fleet would transform city centres; doing the same for taxis and trucks would amount to a revolution.

Vehicles are just the start. Millions were spent on a programme of “Warm Homes”; what about “Quiet Homes”? How did we value the noise impact in the decision to build a third runway at Heathrow, and how do we compensate people now that it’s going ahead?

Construction is a major driver of decibels. Should builders compensate “noise victims” for over-drilling? Or could regulation push equipment manufacturers to find new ways to dampen the sound of their kit?

Of course, none of this addresses the noise pollution we impose on ourselves. The bars and clubs we choose to visit or the music we stick in our ears. Whether pumping dance tracks in spin classes or indie rock in trendy coffee shops, people’s desire to compensate for bad noise out there by playing louder noise in here is hard to control for.

The Clean Air Act of 1956 heralded a new era of city life, one where smog and grime gave way to clear skies and clearer lungs. That fight still goes on today.

But some day, we will turn our attention to our clogged-up airwaves. The decibels will fall. #Twitter will give way to twitter. And every now and again, as we step from our homes into city life, we may just hear the sweetest sound of all. Silence.

Adam Swersky is a councillor in Harrow and is cabinet member for finance. He writes in a personal capacity.