Guest Stars Ncuti Gatwa as Eric Effiong Emma Mackey as Maeve Wiley Connor Swindells as Adam Groff Aimee Lou Wood as Aimee Gibbs Kedar Williams Stirling as Jackson Marchetti Alistair Petrie as Headmaster Michael Groff Mimi Keene as Ruby Matthews Samantha Spiro as Maureen Groff Chinenye Ezeudu as Viv Odusanya George Robinson as Isaac Goodwin Dua Saleh as Cal Bowman Hannah Waddingham as Sofia Marchetti Sharon Duncan-Brewster as Roz Marchetti Conor Clarke McGrath as Courgette Connor Thaddea Graham as Sarah "O" Owen Reda Elazouar as Beau Alexandra James as Aisha Indra Ové as Anna Lisa McGrillis as Joanna Hannah Gadsby as Celia Anna Francolini as Gloria Masters Felix Mufti as Roman Anthony Lexa as Abbi Montgomery Edward Bluemel as Sean Wiley Bella Maclean as Jem Shak Benjamin as Adedeyo Gbolahan Obisesan as Pastor Samuel Juliette Alexandra as PK Eshaan Akbar as Principal Lakhani Claire Cogan as Caretaker Siobhan Fin McCarty as Celia's Son Jola Jassy as Ghosted Student Sarah Toogood as Dr. Miller Amy Gledhill as Esthetician Marva Alexander as Church Choir Sam Parks as Funeral Director