Worried that the housemates are showing their age, Iain decides the group should throw a party in a desperate attempt to cling onto their youth.
After the break-up with Greg, Ashley and the others go to a singles night where Iain bumps awkwardly into his ex Olivia and Rosie finds some 'icks' about.
Iain tries to impress his dad by pitching an idea for a ground-breaking primetime TV show to a commissioner with the help of Finn and Rosie.
The gang are in the countryside to party with a legendary university friend of Iain's, but they soon find that he's not the person he used to be.
When the gang find themselves with a 'free day', they have to decide what to do with it - and Greg soon finds himself with the biggest decision of all.
Iain has decided to leave Flummox, but is this really what he wants, or will he finally have the courage to tell Olivia how he feels?