Guest Stars Oscar Kennedy as Young Liam Sam Bottomley as Ralph Roberts Aqib Khan as Adnan "Addy" Masood Shaun Thomas as Tom "Craggy" Cragg Rosie Cavaliero as Linda (Liam's Mum) Steve Pemberton as The Gardener Emma Beattie as Cambridge Interviewer Gareth Kane as Solar Panels Customer Jemma Churchill as Mrs Peacock Andrew Turner as Fake Librarian Don Gallagher as School Interviewer Joel Phillimore as Marcus Olivia Jerdin as Kara