A final decision on whether to go ahead with the controversial HS2 high-speed rail line between London and Birmingham is being delayed until the New Year, it has been disclosed.
Transport Secretary Justine Greening is understood to be considering whether a £500 million tunnel should be bored to minimise impact on the Chiltern Hills landscape.
The 100-mile rail link, due to be built between 2016 and 2026, aims to cut the London-to-Birmingham journey time to 49 minutes.
However, the £32 billion project has provoked fury among many Tory MPs - including Welsh Secretary Cheryl Gillan, who has reportedly threatened to resign over the issue.
Ms Greening had been expected to make a final announcement before parliament rises for its Christmas break.
But the decision has now been delayed until January as she has asked for a feasibility study to be carried out on a £1.5 million tunnel near Amersham, as well as an environmental probe.
The money would come from within the existing budget, as savings have been identified from other parts of the route.
Suggested For You
Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements. Learn more