Boris Johnson is heading for a rebellion by up to 60 Conservative MPs by giving the go-ahead for the controversial £100bn flagship rail project, HS2.

The hugely expensive scheme is expected to be approved at a special meeting of the cabinet and then the prime minister will announce the decision in a statement in the Commons.

In a bid to placate potential rebel MPs, the PM's statement will also include the announcement of £5bn of new funding to overhaul bus and cycle links for every UK region outside London.

The package includes at least 4,000 new zero emission buses to promote greener commuting, over 250 miles of new cycle routes and dozens of new 'Mini-Holland' schemes, designed to make town centres safer and greener for cyclists and pedestrians.

The go-ahead for HS2, which will eventually slash journey times between London and the north of England, is seen as a move to repay northern voters who swept Mr Johnson into Number 10 in December.


As a result, it has become a political imperative for the prime minister, who won his 80-seat Commons majority with pledges to improve infrastructure in the north of England and the Midlands.

But it risks a furious backlash from Conservative MPs in the home counties and middle England, who are bitterly opposed to the project on grounds of its ballooning cost and the destruction of rural beauty spots.

Nearly 60 Conservative MPs are backing an HS2 Review Group, a caucus of Tories opposed to the scheme including a number of new MPs elected to the Commons in the December election.

HS2: Vanity project or valuable investment?

The Taxpayers' Alliance has also condemned the go-ahead. Spokesman Harry Fone said: "This announcement is a massive blow to the taxpayers of today and tomorrow who will be left paying for the HS2 white elephant with no light at the end of the tunnel."

Meanwhile, Greenpeace said Boris Johnson's decision will give him "the dubious honour of being this century's largest destroyer of irreplaceable ancient woodlands in the UK".

But Mr Johnson's decision to back HS2 after months of wrangling and the cost trebling since it was first conceived more than a decade ago reflects his determination to go ahead with major infrastructure projects.

The prime minister is said to want to see the biggest infrastructure revolution since Victorian times and has even ordered civil servants to carry out a feasibility study for a £20bn bridge between Scotland and Northern Ireland.

On HS2, he is likely to announce that work on the London to Birmingham and Birmingham to Crewe sections can begin immediately, opening in 2036. But it is thought that a phase from Manchester to Leeds will be delayed until 2040 to make sure it is cost-effective.

This review is likely to recommend integrating HS2 with the new Northern Powerhouse line linking cities including Liverpool, Manchester, Bradford, Sheffield, Leeds and Hull.

'In a hole the size of HS2, you have to keep digging'

Other projects expected to be given the go-ahead include the repeatedly delayed electrification of the Trans-Pennine route between Manchester and York, a £3bn upgrade that will enable more trains to run and cut journey times.

In backing HS2, the prime minister is overruling his controversial special adviser Dominic Cummings, who has described it as "a disaster zone" and his transport adviser Andrew Gilligan, who have both argued for the project to be scrapped.

But the decisive moment in the Whitehall wrangling over the project came last month when the Chancellor Sajid Javid let it be known that after a Treasury analysis that he backed it ahead of a crucial meeting with the PM and the Transport Secretary Grant Shapps.

Mr Javid refused to confirm the final decision in the hours leading up to the announcement, but balked at the suggestion the splurge would be better spent improving east-west transport links.

"It's not about instead of," he told Sky News' Kay Burley@Breakfast, adding: "We can still as a country invest in better connectivity across our cities."

Two of the biggest backers of HS2 have been the big-city mayors, Labour's Andy Burnham of Greater Manchester and the Tories' Andy Street in the West Midlands. Senior Tories believe the go-ahead is crucial to Mr Street's chances of re-election in May.

Travelling at up to 250mph, HS2 is designed to reduce journey times between London and Birmingham from 80 to 45 minutes and between London and Manchester from 128 to 68 minutes.

The cost was originally estimated at £3bn in 2009, then £56bn in 2013, but is now expected to cost £106bn, though the National Audit Office has said it is impossible to estimated with certainty what the final cost will be.