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."
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Journalist Steve Hewlett, who shared his experience of battling cancer on BBC Radio 4, has died of the disease at the age of 58.
A long-time diplomat, Churkin had been Russia's permanent representative to the UN since 2006.
The feature is usually seen as an annoyance for users and the company said it plans to focus on shorter ad formats.