Guest Stars Jonathan Bailey as Titus Mortmaigne Juliet Aubrey as Selina Mortmaigne Nathaniel Parker as Philip Coleman Guy Henry as Professor Pelham Stella Gonet as Frances Woodville Camilla Arfwedson as Scarlett Mortmaigne Georgia Groom as Briony Grahame Jonty Stephens as Ralph Grahame Hugh O'Conor as Father Jasper Pip Carter as Paul Hopkiss Gerard Horan as DC Hooper Richard Johnson as Augustus Mortmaigne Richard Saade as Tarek Shimali Alex Knight as Bus Driver