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I understand that the prime minister is unwilling to publish details of the guests, including party donors, who have had dinner with him in his Downing Street flat.

David Cameron's aides say that the flat is his home and that he is entitled to keep private who he entertains - particularly since he and not the taxpayer pays for the hospitality.

I am told that guests have included party donors but Peter Cruddas, who resigned as Tory Treasurer last night, was not amongst them.

Those invited are said to have included only those donors whom Mr Cameron has known for many years - such as the former Tory Treasurer Michael Spencer and current Conservative Chief Executive Andrew Feldman, who is an old friend from University.

One source told me that it was simply untrue to suggest that there was "routine selling of access to David and the flat".