Guest Stars Raza Jaffrey as Jack Oliviera Oliver Chris as Guy Cavendish Abhin Galeya as Raz Farooqi Alexander Karim as Lars Nordström Julie Graham as Susan Fisher Elizabeth Dulau as Louise Pennycook Dean Ridge as Simon Segman Jennifer Macbeth as Tessa Joseph Aurora Jones as Maggie Cavendish Joe Thomas as Matt Malyon Haydn Gwynne as Anne MacDiarmid Cheryl Mackie as Mrs. Williams Darren Hart as Mr. Williams Matilda Ziegler as Becky Hillford Mat Fraser as Steve Shaheen Khan as Sania Masoom Sabina Arthur as Kim Allerton Guy Williams as Prof. Thomas Stephanie Jacob as Mrs. Smith Cleo Sylvestre as Mrs. Osei Bill Skinner as Will D'Vante Hart as Edward Elan Butler as Freddie