Prince William may be busy on royal duties, or taking care of his pregnant wife Kate Middleton and their child Prince George, but before the Duke of Cambridge was being groomed for the throne, he secretly completed work experience at a stately home on a Derbyshire estate nearly ten years ago.

Prince William
Prince William was worked as a joiner at a stately home at Chatsworth House in Derbyshire

Two weeks after graduating from university in 2005, aged 23, Prince William worked as a joiner and making mince pies at Chatsworth House, the author of 'Chatsworth: The Housekeeper's Tale' Christine Robinson recently revealed.

Robinson, who spent 40 years working at the stately home owned by the Duke and Duchess of Devonshire, which also features in Keira Knightley's 2005 film 'Pride and Prejudice,' remembers the young prince working and living incognito for a fortnight in her memoir.

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"He spent a week working around the estate and made sausage rolls and mince pies," she wrote, according to the Express. "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 added, "We were staging a ballet in the theatre, but discovered the stage was too short and had to be extended. He was carrying planks of wood through the shop dressed in workmen's clothes."

Chatsworth House is one of the most visited stately homes in England, so Prince William's presence undoubtedly caused a stir amongst the curious public.

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"The look on visitors' faces was priceless, most obviously thought to themselves, 'That joiner is the double of Prince William,'" she continued. "When two old ladies came straight out and asked him he admitted he really was the heir to the throne. He was, of course, charming."