Kim rolls out a fresh initiative that causes fireworks for staff and pupils alike, and two worlds collide when Tonya forms an unlikely bond with new boy Schuey.
Elliot seeks help from an unlikely ally to secure his escape from the island. Meanwhile, Helen gets acquainted with some threatening figures as she continues to track Elliot down.
Alan Bates and the sub-postmasters begin their fightback with new allies in Westminster, but first they must convince an independent investigator of their honesty.