A report outlining HS2's economic case could now be made public thanks to a legal challenge.

The report from the Major Projects Authority had previously been withheld after Transport Secretary Patrick McLoughlin used a rarely-used power of veto to prevent publication.

That 2014 decision to use the veto can now be challenged through a Judicial Review following the recent Supreme Court ruling over the release of letters written by Prince Charles.

It was previously ordered the HS2 hearing should not begin until after the Prince Charles ruling had been made, as several points of law were the same.

Mr McLoughlin refused to allow the publication of the Major Projects Authority report - which said the HS2 scheme had an amber-red rating, meaning it was in danger of failing - last year, saying it was needed to protect civil servants working on the project.

Information Commissioner Graham Smith also ruled this week that HS2 Ltd, the company behind the project, should make a copy of the report available to a member of the public who asked for them through a Freedom of Information request.

Mr Smith said the report could be released as it was no longer regarded as an internal government document.