Sir Michael Peat, Prince Charles' most trusted advisor, is stepping down.
Clarence House announced this week that the 61-year-old former chartered accountant - pictured cycling to work - will return to the private sector.
Sir Michael has spent nine years as the heir to the throne's aide - and helped plan his wedding to the Duchess of Cornwall.
As his private secretary the father-of-three is responsible for the royal's household, finances and charities.
He will stay on in his post until a replacement is found – a process which could take up to a year.
Sir Michael said: "I have learned a huge amount and will be forever in His Royal Highness' debt;
"But after nine years the time is right for a change, for their royal highnesses' household and for me."
Photo: © Rex Features