In a statement, the Commissioner's office said: "The
Parliamentary Commissioner for Standards has received a complaint against Mr Keith Vaz in respect of the allegations made in recent weeks.
But John Lyon, the
Parliamentary Commissioner for Standards, accepted that the Yorkshire house, in Castleford, was in fact their "family home".
The
Parliamentary Commissioner for Standards, John Lyon, is considering a formal complaint after Hain failed to declare more than pounds 100,000 in donations to his Labour deputy leadership campaign.
The
parliamentary commissioner for standards, Sir Philip Mawer, has confirmed that he was considering a complaint from shadow culture secretary Hugo Swire that Mr Prescott failed to declare a stay at the tycoon's ranch in the register of members' interests.
Parliamentary Commissioner John Lyon upheld a complaint about a newsletter sent by the Labour MP to voters outside her Lewisham East constituency using the Communications Allowance.
A Keioc spokesperson said: "We will be referring this matter to The
Parliamentary Commissioner for Standards as we believe that there are a number of matters that need to be clarified concerning Mr Kilfoyle's conduct."
John Lyon, the
Parliamentary Commissioner for Standards at Westminster, said he was "considering carefully" whether to investigate Conservative chairman Caroline Spelman.
Mr Mercer, a former shadow minister, referred himself to the
Parliamentary Commissioner for Standards, Kathryn Hudson, when allegations that he had tabled Commons questions and offered a Westminster security pass after signing a deal that paid him PS4,000 emerged last year.
Lib Dem leader Nick Clegg said the six - all tenants of Dolphin Square near Parliament, which houses many MPs' flats - had referred themselves to the
Parliamentary Commissioner for Standards.
The
Parliamentary Commissioner for Standards announced last night that he would investigate claims that communities minister Shahid Malik claimed taxpayers' money for two offices.
The ruling follows criticism of Channel 4 by the
Parliamentary Commissioner for Standards, which cleared Sir Malcolm and Mr Straw of wrongdoing and called into question the accuracy of the reporting.
Labour MPs John Mann and Kevan Jones said that they had lodged a formal complaint with the
Parliamentary Commissioner for Standards, John Lyon.