The sale of the Government's stake in Eurostar is "further evidence" of assets being undervalued, according to a report by MPs.

In early 2015 the Government's 40% holding in the Channel Tunnel passenger train operator was sold for "almost double" the valuations of its financial advisers, the influential Commons Public Accounts Committee noted.

The committee also raised concerns about the Department for Transport's "unacceptable" two-year delay in publishing an evaluation of Britain's first high-speed rail line and claimed it denied Parliament the ability to use "important information" when considering HS2.

PAC chairwoman Meg Hillier said the issues over the Eurostar sale and the HS1 report "raise serious questions about the Government's approach to valuing public assets, as well as its commitment to considering the value for money of public spending on such expensive projects".

The PAC concluded that there is an "over-reliance" by the Treasury on a "small pool" of advisers.

It stated that the financial services firm used by the Treasury for the Eurostar sale - UBS - was also involved in the controversial privatisation of Royal Mail.

The sale of the Government's entire financial interest in Eurostar generated proceeds of £757 million, which is "significantly less" than the estimated expenditure by taxpayers of £3 billion, the PAC said.

The committee stated that while the difference between the pre-sale valuations and the actual total may be due to "the successful sale process and favourable market conditions", it also claimed it is "further evidence of the Government and its advisers undervaluing assets".

The PAC recommended that the Treasury should "examine the underlying causes" of the "repeated tendency" to undervalue, and to use a wider pool of financial advisers.

A Treasury spokeswoman said: