McArdle will play Lord Loxley - estranged husband of Lady Mae Loxley (Katherine Kelly), while Walker is cast as Delphine Day - a Bohemian novelist and businesswoman who befriends Harry Selfridge's wife Rose (Frances O'Connor).
Ten new episodes of Mr Selfridge - set four years after the events of the first series - began filming in London this week.
Series two will follow Harry Selfridge's efforts to keep his department store afloat as the Great War approaches.
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