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Thanks for looking for me Chris, but that's a different series. Found this, also courtesy of Mr Google and think this is the one that was being discussed. Called The Great.
Period comedy with Elle Fanning
Channel 4 has bought the rights to a new period comedy about Catherine The Great.
The ‘genre-bending, anti-historical’ show stars Maleficent's Elle Fanning as the controversial Russian Empress and X-Men actor Nicholas Hoult as her husband, Peter III of Russia.
The Great also stars Charity Wakefield, who played Jack Whitehall’s sister in Bounty Hunters, and Sacha Dhawan, who plays The Master in Doctor Who, and Bohemian Rhapsody’s Gwilym Lee.
It has been written by Tony McNamara, who was nominated for an Oscar for his screenplay for Olivia Colman’s The Favourite.
The series will premiere on US streaming service Hulu on May 15, but no date has yet been announced for its UK broadcast.