Guest Stars Oscar Kennedy as Young Liam Sam Bottomley as Ralph Roberts Aqib Khan as Adnan "Addy" Masood Shaun Thomas as Tom "Craggy" Cragg Lily Frazer as Jess James Dryden as Mr Dreyfus Con O'Neill as Mr Stones Katy Wix as Miss Monroe Rob Carter as Hipster Boss Emily Lloyd-Saini as Dr Cheryl Watkin-Wynn Conor Lowson as Hard Lad