Presumably, Connor, Locke, Finney, Gao, Donovan, Brown, Edgell, Norwood, and Khan will all be back for season three. Sebastian Croft's Ben tells Charlie toward the end of season two that he's leaving their school, so it seems he won't be around for more episodes, but fans can probably expect to see most of the main casts' schoolmates next season. The season finale also teased that we'll see more of Higgs teachers Mr. Ajayi (Fisayo Akinade) and Mr. Farouk (Nima Taleghani). Season three will presumably also see the return of Oscar winner Olivia Colman as Nick's mum.