David Hill was the Prime Minister’s official spokesman after Alastair Campbell's stint in that role.
Champollion said it was delighted to have Hill’s experience of government, as well as his media contacts, at its disposal.
The agency has also hired Craig Morley, who founded and ran a social business called The Challenge, which now has 50,000 young people as beneficiaries and is a main deliverer of the Government’s National Citizenship Service programme.
Hill and Morley both took up their roles this week.
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