He told PRWeek: ‘It is a big leap and I'm sure it will be a very different culture to the Mirror.
‘I also recognise that there will be plenty to learn about life on the other side of the PR/media divide. I’m excited by the challenge and hope to bring some useful insight and media savvy acquired during 20 years in senior positions on two of the UK's top tabloids.’
Manning started his journalism career in 1983 as a graduate trainee at the Sutton Coldfield News before stints at the Birmingham Evening Mail and Birmingham Post.
James Henderson, MD at Pelham, added: ‘We welcome the experience Clinton brings, which will be invaluable as we continue to grow the business. Given Pelham Bell Pottinger’s rapid expansion, we are keen to continue to attract the City’s leading media specialists.’
Chime Communications bought a 60 per cent stake in Pelham in early 2010 and merged with Bell Pottinger Corporate & Financial.
Pelham is understood to be one of the businesses at the centre of Lord Bell and Piers Pottinger’s bid to acquire parts of Chime’s public relations division.