In the episode, the prince chats with Lord and Lady Fitzalan-Howard, two main characters from the series. Charles meets the couple at the Great Yorkshire Show, an annual agricultural show in Harrogate, England. “They are looking for a new herd of cattle when Prince Charles stops to give them some advice. He leaves the Fitzalan-Howards stunned!” Keeping Up With The Aristocrats.
It is not surprising that Prince Charles shows up at an agricultural fair. The Prince has an organic farm on his Highgrove House estate in Gloucester. There he grows vegetables and fruit that are also sold to restaurants and supermarkets.