The Duke of Cambridge once spent two weeks working "downstairs" at a real-life Downton Abbey.
William (inset) donned overalls when he stayed for a fortnight, living incognito and helping out as a joiner at Chats-worth House in Derbyshire in 2005.
Head housekeeper Christine Robinson, who has spent more than 40 years at the mansion, told of William's stint of work experience in her book Chatsworth: The Housekeeper's Tale.
"He spent a week working around the estate and made sausage rolls and mince pies," she said.
"Then he spent a week at the house, dressed in overalls, drinking tea and eating fish and chips with the rest of the housemen and joiners."
She recalled how he was seen carrying planks of wood as he helped extend a theatre stage.
"Most visitors obviously thought to themselves 'that joiner is the double of Prince William'," she said.