Jonathan Caine will quit his post as assistant director of the Conservative Research Department next month to become a director at Bell Pottinger Public Affairs.
Caine is a former adviser to ex-prime minister John Major and was chief speechwriter for ex-leader William Hague. Caine advises Cameron on policy areas including Northern Ireland and House of Lords reform.
His appointment is a coup for BPPA, providing the agency with a valuable link to Cameron's inner circle. It comes two weeks after BPPA director Jonathan Oates left to be director of comms at the Liberal Democrats.
SEPARATELY... BPPA chair Peter Bingle responded to newspaper revelations that the firm is charging £50,000 for The Brown Book - a 130-page analysis of key players in the Brown camp.
Bingle told PRWeek that clients got the document for free. He added: ‘It's perfectly reasonable for public affairs companies to provide briefings on what a Brown government may be like and who the key players will be. We are not the only public affairs company to do this.'