Her resignation in part prompted the Committee on Standards in Public Life's inquiry into whether regulations governing MPs are adequate to ensure the highest standards of propriety.

BBC: Inquiry examines MPs' watchdog role

Correspondingly, we have watched the deterioration of the sense of stewardship that once was so widespread among the most successful Americans and the near disappearance of the sense of seemliness that led successful capitalists to be obedient to unenforceable standards of propriety.

WSJ: Charles Murray: Why Capitalism Has an Image Problem

Its remit, which does not focus on alleged misdemeanours by individuals, is described by the committee as a "useful check on current standards and the effectiveness, or otherwise of the arrangements in place to ensure the highest standards of propriety in public life".

BBC: Sir Christopher Kelly