Recent analysis has found approximately a quarter of Tory MPs have second jobs, with some earning several times their ￡81,000 Parliamentary income. More than 90 members received payment for work on the side, raking in a combined total of ￡4 million. Now another high profile Conservative MP - Sir Geoffrey Cox - is being investigated after a video emerged appearing to show him undertaking external work from his Westminster office.

       Labour has referred Sir Geoffrey to the Commons standards commissioner following a report from The Times.

       The report said the practising barrister used his MP office in September to remotely advise the British Virgin Islands over a corruption probe launched by the Foreign Office.

       A statement from Sir Geoffrey's office said: "As for the allegation that he breached the parliamentary code of conduct on one occasion, on September 14 2021, by being in his office while participating in an online hearing in the public inquiry and voting in the House of Commons, he understands that the matter has been referred to the Parliamentary Commissioner and he will fully co-operate with her investigation.

       "He does not believe that he breached the rules but will of course accept the judgment of the Parliamentary Commissioner or of the committee on the matter."

       Prime Minister Boris Johnson declined to comment on individual cases when asked about Sir Geoffrey but said those who were not putting the interests of their constituents first should face punishment.

       Despite the anger from Labour, opposition MPs have also flirted with second incomes, with some notable members pulling in six-figure totals.

       READ MORE: Boris Johnson rages at MPs not following second job rules

       The recent furore around MPs second jobs has sought for Parliament to draw a distinction between those who conduct work in consulting and others who came into politics from other roles such as GPs.

       Mr Paterson, who resigned amid the upheaval last week, worked as a consultant for two organisations, Randox and Lynn's when Parliament's Standards Committee found he made "egregious" breaches of lobbying rules.

       Labour has one MP receiving consultancy cash, and others taking income from media contributions, advice and more.

       One of the party's most influential members, David Lammy has taken income from several additional positions while working as MP for Tottenham.

       The Harvard trained lawyer and shadow justice secretary made money from speaking at business events according to the Daily Mail, which explored his declared receipts.

       His top three highest-paid single appearances included delivering an anniversary lecture to City University for ￡4,100, a speech at law firm Mischon de Raya for ￡2,500 and another ￡2,500 for speaking at a Black History Month event hosted by Citibank.

       But his most lucrative role is with LBC, the station that once employed Nigel Farage.

       The Daily Mail found he has claimed ￡40,000 over the last three years and altogether has taken home ￡140,000.

       Mr Mamood, the member for Birmingham Percy Barr, is the only Labour MP currently receiving payment for consultancy work.

       Although not a current Labour frontbencher, he did work as the shadow foreign secretary until April, when he resigned.

       He works for the Policy Exchange think tank, an influential right-wing organisation based in London.

       The MP earns roughly ￡25,000 a year on top of his Commons salary for up to 180 hours of work.

       His advice covers social cohesion, employment and extremism.

       The MP for Rhondda once served as deputy leader of the House of Commons during Labour's last administration between 2008 and 2009.

       Presently, he serves as chair of the Committee on Standards and Privileges, which found those "egregious" breaches made by Mr Paterson.

       But he has also received money from outside his constituency work before.

       The Daily Mail found he had received ￡2,000 from Goldman Sachs for speaking at an event of theirs.

       The Labour MP for Barking once boosted her income with a role at Royal Holloway University.

       She received a ￡20,000-a-year salary for her work with the university.

       Dame Margaret sat atop the university's governing College Council as Chair starting from 2018.

       She is not a Labour frontbencher but has served the party since 1994.