They will appear alongside a supporting cast which includes Charlotte Hope (Game of Thrones), Craig Parkinson (Line of Duty), James Harkness (Darkest Hour), Niamh Walsh (Jekyll & Hyde) and Daniel Ings (Lovesick).
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This is one of two series penned by Fellowes that is set to launch this spring. Belgravia, an ITV period drama about two wealthy families connected by a private scandal, will also air in the coming weeks.