Spencer and Alex take a holiday with their girlfriends and Jamie decides to fly over a group of his single friends over to shake things up. Andy and Jamie vie for Jess's attention. Spencer feels caught between Lauren and the boys and finds it hard to settle down to domestic bliss.
Alex starts to introduce Nicola to the others. The cracks begin to appear in Josh and Stephanie's relationship. Andy continues with his campaign to win over Jess.
Andy is confused about Jess. Steph and Josh are back on track having sorted out their recent issues. Louise is not pleased about Alik's new laid-back approach to life.
After Binky sees JP at the rugby, Andy decides to play Cupid between them. JP's friends James and Elliot enjoy a night out with the boys and they end up hitting on somebody familiar. Louise berates Alik over his failure to be more proactive.
With Andy away on tour, Jamie is unable to stop thinking about Jess and he finds the courage to tell her he really likes her. Binky and JP play Cupid for Lucy and James.
Nicola is not happy after Jamie's shock revelation that Jess has 'unfinished business' with Alex. Jess is clueless that Jamie has betrayed her trust and is surprised after Nicola brings it up. Lucy and Stephanie's friendship is on the line following Lucy and Josh's confrontation.
Spencer is invited by Jamie to the biggest ski chalet in Europe with a select group including Lucy. Spencer needs to decide between trying to keep Lauren happy and rekindling an old friendship.
Alik gets a call from America that could change to his life in Chelsea. JP does not know why Binky is being distant towards him following their return from the ski trip. Lucy receives an unexpected text message from Spencer's girlfriend.
Louise is shocked that Alik has to go back to New York, and their friends all think that he doesn't really want a long-distance relationship. Tempers are lost after Lucy finds out that Tiffany has been secretly dating Sam and hanging out with Steph.
Rick Edwards presenting a behind-the-scenes trip down memory lane as the show celebrates its 100th episode.
Alik returns to New York after a year in Chelsea, leaving
Louise to face life in the Royal Borough on her own. The problems between Spencer and Lauren increase after he vanishes one night and doesn't return home.
Spencer wishes that he had not cheated on Lauren and it could be too late to win her back. Lauren turns to an unlikely person for some advice. After Nicola finds out that Jamie has been spreading rumours that she and Alex are having problems, she confronts her boyfriend.