Leo Barraclough Senior International CorrespondentOdessa Young (“Shirley,” “Assassination Nation,” “A Million Little Pieces”), Josh O’Connor (“The Crown,” “Emma,” “Gods Own Country”), Olivia Colman (“The Favourite,” “The Crown”) and Colin Firth (“1917,” “A Single Man,” “The King’s Speech”) will star in “Mothering Sunday” for director Eva Husson (“Girls of the Sun,” “Bang Gang – A Modern Love Story”).