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MP Damian Green has had his Kent home and constituency office swept for bugging devices amid concerns that he may have been monitored as part of the Home Office probe into a series of leaks.

His car, which was impounded by the police, and his Westminster office have also been checked.

The MP made his first public engagement in Ashford today after the week’s extraordinary series of events and the continuation of a major political row about his arrest and raid on his Westminster office.

The shadow immigration minister remained tight-lipped about the police inquiry, saying he was unable to comment because of legal advice. He would not be drawn on into commenting on the controversial statement by Speaker Michael Martin about the affair.

However, he emphasised that after a turbulent week, he was keen to get back to the business of looking after his constituents.

"It has been an unusual week but obviously I am under legal advice and cannot talk about any of the legal implications but I am determined to get on with my job and am determined that as much as possible my constituents will not be affected by what has happened," he said after a visit to a local health food shop in Ashford town centre.

His agent Gordon Williams said the decision to sweep his home at Charing and his association office in Bethersden was partly aimed at reassuring constituents who may be concerned about confidential information they chose to share with the MP.

It is understood that no evidence of bugging devices has been uncovered.

A Labour MP has criticised the Speaker of the House of Commons and says he could be forced to quit for his role in the arrest of Conservative frontbencher Damian Green.

Sittingbourne and Sheppey Labour MP Derek Wyatt stopped short of calling for Michael Martin to resign but said his position had been jeopardised by his statement about the affair this week.

He described the affair as "an almighty cock-up" that had been embarrassing for all involved.

Mr Wyatt cricitised Mr Martin for failing to accept personal responsibility for allowing Metropolitan Police officers to search the Ashford MP’s arliamentary office without an arrest warrant.

"MPs are not above the law but the issue is that police need a warrant. It was the Speaker’s job to ensure they did. The buck stops with him, he should not be criticising employees in public," he said.

The widespread criticism directed at Mr Martin, who told MPs that he was unaware that the police had not had a warrant when they searched Mr Green’s office, meant it was likely he would come under pressure "to consider his position over Christmas," he predicted.

"I think the men in grey suits will have to have a word with him...many MPs think enough is enough."

In a related development, Liberal Democrat leader Nick Clegg says his party will boycott the panel of seven MPs being set up to review what happened after it emerged that it would be dominated by Labour MPs.