The Prince of Wales's press secretary Colleen Harris said Sir Michael, advised by herself and a press team of five, would now handle all media work for the Prince. 'Bolland was working in an advisory capacity and there are no plans at the moment to appoint a new consultant,' she said.
Bolland was brought in to work as Prince Charles' deputy private secretary after the Prince's divorce around seven years ago, and became an external adviser after launching his own agency, Mark Bolland & Associates, last April.
He has been credited with turning around the public image of both Charles and Camilla Parker-Bowles.
He declined to comment on rumours that he resigned after a rift with Sir Michael, who was appointed last August.
Mark Bolland & Associates will continue to handle ad hoc advisory work for Camilla Parker-Bowles on an unpaid basis, alongside handling other clients including Camelot.