Met chief: '˜Damian Green porn claims should not have been revealed'

Investigations are under way into allegations that pornography was found on Mr Green's parliamentary laptop in 2008. Picture: Dan Kitwood/Getty Images

Ms Dick insisted that the duty of confidentiality undertaken by officers continued after they left their posts.

Mr Green, who is the subject of a Cabinet Office inquiry, has strongly denied that he downloaded or watched porn on the computer.

The Metropolitan Police Commissioner told LBC: “Police officers have a duty of confidentiality. We come into contact with personal information very regularly, sometimes extremely sensitive.

“This is a daily occurrence for any officer. We all know that we have a duty to protect that information and to keep it confidential. In my view, that duty endures.

“It endures after you leave the service, so I believe that what this officer and, indeed, other retired officers, appears to have done is wrong and my professional standards department will be reviewing what has happened in relation to how information has been handled and if any offences are disclosed, we will investigate them.”

Asked if prosecutions could occur in such circumstances, she said: “Undoubtedly, if offences have been disclosed and that can be proved, it would be a matter for the Crown Prosecution Service, but there could be a prosecution. I’ve said before I don’t want to give a running commentary on this matter. It’s clearly sensitive, it’s controversial and there is a Cabinet Office inquiry running in parallel, as you know, but today, I think it is appropriate that I say that what they appear to have done seems to me to be quite wrong.”

Allies of the First Secretary of State have expressed concern about comments made by two former Metropolitan Police officers regarding an investigation into government leaks when Mr Green was an opposition home affairs spokesman nearly a decade ago.

Ex-detective Neil Lewis told the BBC last week he was shocked at the volume of pornographic material found on Mr Green’s Commons computer and had “no doubt whatsoever” it had been amassed by the Tory MP.

The allegation echoed claims made by former assistant commissioner Bob Quick, who went public last month with his account of the material discovered during a police raid on Mr Green’s parliamentary office.

Ms Dick said she “condemned” the comments made by ex-officers regarding the 2008 investigation.

She said: “It is my view that what they have done, based on my understanding of what they are saying, what they have done is wrong.”