The first phase of HS2 is expected to bust its budget by “many billions” of pounds, as the Treasury demands further cuts to the high-speed rail link.
An internal review said it was “very unlikely” that the £40.3bn price tag for the London to Birmingham section would be met. Although the first phase allowed for a contingency that would stretch the budget to £44.6bn, the report concluded there was only a 50% chance that would be enough.
The final cost was likely to be “many billions more than the reported estimate”, the document said.