Jez and Sian Diamond plan a dinner party so that they can try to get to know their colleagues better but the unexpected arrival of Jez's estranged children, Madi and Zack throws everything up into the air. Michael's A-level recruitment drive sees him at loggerheads with Grantly. Scout's enthusiasm for the guitar touches Matt. Vicki ends up being inspired to retake her A-level sciences, but after Ronan throws a surprise house-warming party it highlights the differences between them.