Foreign Secretary David Miliband has defended the next head of MI6 after details of his personal life were posted on social networking website Facebook.

Pictures and private details of Sir John Sawers, who will take on the post in November, were revealed on an easily accessible profile page of his wife, Lady Shelley Sawers.

The page was taken down after the Mail on Sunday informed the Foreign Office.

Mr Miliband denied that national security had been compromised, saying it was "no state secret" that the MI6 chief wore Speedos on holiday.

And shadow business secretary Ken Clarke said the UK's enemies "did not wholly rely on the Mail on Sunday and Facebook for their information".

Lady Sawers disclosed details including the location of the London flat used by the couple and the whereabouts of their three children and of Sir John's parents, the Mail on Sunday reported.

Mr Miliband told BBC1's Andrew Marr Show: "What are you leading the news with that ... The fact that there's a picture that the head of the MI6 goes swimming. Wow that really is exciting. It is not a state secret that he wears Speedo swimming trunks, for goodness sake let's grow up."

Mr Clarke dismissed the potential security implications of the information - which he said he was certain Britain's enemies would have already known.

"In the old days we used to keep the name secret, all photographs were banned and I never really believed that the Russians didn't know who the head of MI6 and MI5 was," he told Sky News' Sunday Live. "I suspect that the enemies of this country do not wholly rely on the Mail on Sunday and Facebook for their information so I personally would get a little more calm."

The Liberal Democrats insisted that Gordon Brown should call an inquiry. Foreign affairs spokesman Ed Davey said: "Normally, I would welcome greater openness in Government for officials or politicians but this type of exposure verges on the reckless."

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