Exclusive: Adonis warns that "incompetent" coalition must control costs if HS2 is to survive

The architect of High Speed 2 and the head of Labour's growth review says that Ed Balls's threat to withdraw support for the project has "raised the bar".

After Ed Balls threatened to withdraw Labour's support for High Speed 2 and suggested that the £42.6bn allocated to the project could potentially be better spent elsewhere, I spoke to Andrew Adonis, the former transport secretary and the architect of HS2, at a New Statesman fringe event last night to get his response.

In his first reported comments since Balls's speech, Adonis, who is the head of Labour's growth review and shadow infrastructure minister, told me that the shadow chancellor had "raised the bar" for the project and that the "incompetent" coalition needed to demonstrate that it could "keep costs under control" if HS2 was to survive. He criticised the government's failure to pass legislation more quickly and to manage the programme effectively: "all they've done since coming to office is add £10bn to it".

Adonis, who warned in a recent New Statesman piece that it would be an "act of national self-mutilation" to cancel HS2, told me: "the current contingency fund of £14bn is too large and the cost needs to come down when the bill has its second reading in February/March." He added: "it's no surprise opinion is turning against it if people fear it will end up costing £100bn."

In his speech, Balls said: "the question is – not just whether a new high-speed line is a good idea or a bad idea, but whether it is the best way to spend £50bn for the future of our country. In tough times it's even more important that all our policies and commitments are properly costed and funded."

Adonis warned in his piece that the urgent need to increase rail capacity (the West Coast Main Line will be full by 2024) meant there was "no free lunch - or pot of gold which can be diverted to other projects in anything but the very short-term, with more costly consequences thereafter". But at a fringe meeting last night, Balls openly speculated on whether the HS2 money would be better spent on "building new homes or new schools or new hospitals".

With Miliband due to pledge in his speech today to build a million new homes over the course of the next parliament, it's unsurprising that Ballls is attracted by the option of scrapping HS2. It would allow Labour to raise billions for other projects while remaining within George Osborne's fiscal envelope. For Balls, understandably wary of making the case for borrowing to invest, that is political gold.

Labour peer and former transport secretary Andrew Adonis, who first announced plans for High Speed Two in 2010. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

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To stop Jeremy Corbyn, I am giving my second preference to Andy Burnham

The big question is whether Andy Burnham or Yvette Cooper will face Jeremy in the final round of this election.

Voting is now underway in the Labour leadership election. There can be no doubt that Jeremy Corbyn is the frontrunner, but the race isn't over yet.

I know from conversations across the country that many voters still haven't made up their mind.

Some are drawn to Jeremy's promises of a new Jerusalem and endless spending, but worried that these endless promises, with no credibility, will only serve to lose us the next general election.

Others are certain that a Jeremy victory is really a win for Cameron and Osborne, but don't know who is the best alternative to vote for.

I am supporting Liz Kendall and will give her my first preference. But polling data is brutally clear: the big question is whether Andy Burnham or Yvette Cooper will face Jeremy in the final round of this election.

Andy can win. He can draw together support from across the party, motivated by his history of loyalty to the Labour movement, his passionate appeal for unity in fighting the Tories, and the findings of every poll of the general public in this campaign that he is best placed candidate to win the next general election.

Yvette, in contrast, would lose to Jeremy Corbyn and lose heavily. Evidence from data collected by all the campaigns – except (apparently) Yvette's own – shows this. All publicly available polling shows the same. If Andy drops out of the race, a large part of the broad coalition he attracts will vote for Jeremy. If Yvette is knocked out, her support firmly swings behind Andy.

We will all have our views about the different candidates, but the real choice for our country is between a Labour government and the ongoing rightwing agenda of the Tories.

I am in politics to make a real difference to the lives of my constituents. We are all in the Labour movement to get behind the beliefs that unite all in our party.

In the crucial choice we are making right now, I have no doubt that a vote for Jeremy would be the wrong choice – throwing away the next election, and with it hope for the next decade.

A vote for Yvette gets the same result – her defeat by Jeremy, and Jeremy's defeat to Cameron and Osborne.

In the crucial choice between Yvette and Andy, Andy will get my second preference so we can have the best hope of keeping the fight for our party alive, and the best hope for the future of our country too.

Tom Blenkinsop is the Labour MP for Middlesbrough South and East Cleveland