A Treasury spokesman has said that the sale of Northern Rock "represented good value for money."
He said: "We will provide a full response to this report in due course.
"The decision to nationalise Northern Rock in 2008 was taken in the interest of financial stability.
"The sale of Northern Rock plc to Virgin Money last year represented good value for money for the taxpayer, and has helped increase high-street competition."
More top news
Brussels' Zaventem Airport departure hall has reopened to the public, 40 days after twin suicide attacks killed 16 people.
A 21-year-old man accused of planning to travel to Syria and engage in "violent jihad" has appeared in court.
An Australian entrepreneur has publicly identified himself as the inventor of the digital currency Bitcoin.