PricewaterhouseCoopers and Ernst & Young are among the many clients of agencies that book Livingstone for speaking engagements.
The London mayoral candidate has now been asked to declare his interests and apologise to fellow MPs by the Commons all part Committee on Standards and Priviledges.
A report from the committee states: ‘Mr Livingstone’s failure to make an appropriate entry in the Register left the reader of the Register wholly unaware of the scale of Mr Livingstone’s earnings from these sources.’
News of the undeclared interest will come as an embarrasment to Livingstone whose chances on the London mayoral race may well be harmed.
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