Theresa May's government relations chief Chris Brannigan is the latest advisor to depart Downing Street

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May lost 13 seats at the General Election before returning to Number 10. (Source: Getty)

Prime Minister Theresa May has lost yet another advisor with the departure of Downing Street's head of government relations, who led liaisons with business and campaign groups.

Chris Brannigan, a former Iraq war veteran recruited as part of an effort to boost ties with the business world, has followed a number of political staff in departing, despite only joining Number 10 less than a year ago.

Last week it emerged that May's deputy head of policy had quit Number 10, just days after the Prime Minister's co-chiefs of staff departed in the aftermath of the election.

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The flood of departures mean that May could need to reshape her backroom team, despite the appointment of a new chief of staff in former housing minister Gavin Barwell, replacing May's long-time advisors Nick Timothy and Fiona Hill.

However, May is not the only Conservative losing advisors - it emerged that chancellor Philip Hammond had lost one of his longest-serving allies to the Investment Association days before the General Election.