The Standards and Privileges Committee did acknowledge that none of Mr Robinson's omissions seemed to be intentional.

But writing in the Committee's reports MPs did say a further error would be seen as "a serious matter".

'No intentional wrongdoing'

The report said: "This is the third occasion on which we have found that Mr Robinson had failed to register interests.

"None of the failures on which we have reported appeared to be intentional wrongdoing but we are concerned at their cumulative effect."

The report added: "We are surprised that Mr Robinson appears not to have carried out a comprehensive review of his past shareholdings and directorships in order to find out whether there are any such failures of which the House is unaware."

Mr Robinson, the MP for Coventry North West, resigned from the government last December when it came to light that he had loaned his then fellow minister Peter Mandelson £373,000 to buy a house in west London.

Mr Mandelson, the former trade secretary, was also forced to resign over the affair.

The committee upheld complaints against Mr Robinson by Tory MPs David Heathcoat-Amory and Geoffrey Clinton-Brown.

Shareholdings missing

It found that Mr Robinson's failed to register his 100% shareholding of the US-based Roll Center Inc, from 1988 to 1992.

Mr Robinson has already acknowledged the mistake and apologised to MPs last year.

A second complaint was upheld over Mr Robinson's failure to register a shareholding in RJ Engineering Ltd