The Duke of Edinburgh is to take part in a rare official engagement, stepping out of retirement at the age of 99 for a military ceremony at Windsor Castle. Prince Philip, who retired in 2017, will mark the transfer of his role as Colonel-in-Chief of The Rifles to his daughter-in-law the Duchess of Cornwall. The ceremony on Wednesday will begin at Windsor Castle, where the Queen and Duke have been living in isolation since the beginning of lockdown. There, four buglers from The Band and Bugles of The Rifles will sound The Rifles Assembly call as the Duke arrives, in what will be a very rare “live” public engagement since his retirement in 2017. Although he has been seen at private family occasions including the wedding of his grandchildren, his small number of official duties have been confined largely to private audiences with an occasional photograph released. On Wednesday, he will appear outside the castle in front of the media for the ceremony.