Parliament’s sleaze watchdog will consider banning MPs taking second jobs like George Osborne’s Evening Standard editorship next month.

MPs on the parliamentary committee on standards will demand that the rules are tightened after a backlash over Mr Osborne’s new role.

Tommy Sheppard, an SNP MP on the committee, told The Telegraph he would push for two new rule changes to the code of conduct next month.

The first would see MPs barred from taking jobs which stop them fully representing constituents; the second would say no second job can involve more than 20 hours work a week.

Mr Sheppard said: “One of the principles I think there is broad agreement on is that if you have a second or third job, then it must be something that demonstrably doesn't prevent you doing your first job as an MP.