Benedict Cumberbatch Patrick Melrose Actor, Executive Producer Dainton Anderson Thomas Melrose Actor Holliday Grainger Bridget Watson Scott Actor Jessica Raine Julia Actor Indira Varma Anne Moore Actor Pip Torrens Nicholas Pratt Actor Harriet Walter Princess Margaret Actor Irène Jacob Jacqueline D'Alantour Actor Margo Stilley Cindy Smith Actor Anna Madeley Mary Actor Morfydd Clark Debbie Hickman Actor Amanda Root Virginia Watson Scott Actor Richard Dixon David Windfall Actor Prasanna Puwanarajah Johnny Hall Actor Edward Berger Director David Nicholls Writer Edward St. Aubyn Writer Volker Bertelmann Music Stephen Smallwood Producer Rachael Horovitz Executive Producer Michael Jackson Executive Producer Adam Ackland Executive Producer Helen Flint Executive Producer