Opposition parties demand investigation into possible conflicts of interest over 'shocking' arrangement.
The PM's closest aide Mark Fullbrook is not paid directly by the government - but instead gets his salary via a private firm, it has emerged.
A spokesperson for Mr Fullbrook told BBC News: "This is not an unusual arrangement. It was not put in place for tax purposes and Mr Fullbrook derives no tax benefit from it." However, a Cabinet Office spokesperson said: "It is not unusual for a special adviser or civil servant to join government on secondment.
Ms Haddon said there would be a particular concern about any potential conflicts of interest that might arise. She pointed to recent concerns about MPs' second jobs and said the government would need to be "upfront about what they are doing to manage any conflicts of interest".
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