Queen Elizabeth II’s official weekend residence and pandemic hideaway, Windsor Castle, sold December 23 for £21.5 million ($29 million), according to the London-based brokerage behind the sale, Beauchamp Estates. “At the height of lockdown, we showed him the house on Skype on our phones, room by room, while he was based in Russia,” Jeremy Gee, managing director of Beauchamp Estates told The Post, adding that the buyer has made his fortune in the oil industry.