Charles Dance Mr Webb Actor David Morrissey Walter Blackett Actor Colm Meaney Major Brendan Archer Actor Luke Treadaway Matthew Webb Actor Elizabeth Tan Vera Chiang Actor Lilo Baier Kate Blackett Actor Georgia Blizzard Joan Blackett Actor Bart Edwards Ehrendorf Actor Christophe Guybet Dupigny Actor Luke Newberry Monty Blackett Actor Nicholas Agnew Nigel Langfield Actor Julian Wadham Soloman Langfeld Actor Jane Horrocks Sylvia Blackett Actor Christopher Hampton Writer, Executive Producer Tom Vaughan Director Farah Abushwesha Producer Karen Thrussell Executive Producer