Spencer and Alex are on holiday with their girlfriends when Jamie flies a group of single friends over. In London, Steph and Josh adjust to moving in together.

Andy steps up his campaign to win over Jess, and Alex introduces his new girlfriend Nicola to the Chelsea set. Will his ex Binky give Nicola a warm welcome?

Andy is confused by Jess and her mixed emotions, while Steph and Josh are back on track. Louise isn't happy with Alik's very laid-back approach to life.

When Binky spots JP at the rugby, Andy decides to play Cupid, while Jamie presents Andy with some news about Jess that makes him question whether a relationship with her will work after all.

Will Jess wait for Andy, who is away on tour, or fall for the charms of Jamie Laing? while Steph is caught in the middle of feuding boyfriend Josh and her best friend Lucy.

Nicola is fuming about Jamie's revelation that Jess has unfinished business with Alex, and it looks as though Lucy and Stephanie's friendship is in jeopardy following a confrontation with Josh. Will he finally come between them? Meanwhile, Spencer is missing hanging out with his old friend and ex-flame Lucy, and hopes that she and Lauren can finally bury the hatchet.

Mischief-maker Jamie invites Spencer to the biggest ski chalet in Europe with a select gang that includes Lucy. Spencer must decide between keeping Lauren happy and rekindling an old friendship, and while Jess was thrilled that Alex defended her, Nicola was less than impressed. Binky is unsure whether to be heartened or alarmed that JP has never had a girlfriend, but Jamie encourages her that he's a good catch and invites them both along on the trip. Will romance blossom in the Alps?

Alik receives a call from New York that could change his life in Chelsea, and JP is unsure why Binky is increasingly distant since their return from the ski trip. Is the honeymoon period over already? Meanwhile, Lucy gets an unexpected text from Spencer's girlfriend, Lauren Frazer-Hutton, and Sam is behaving suspiciously despite a successful date with Millie. Proudlock and Alik suspect there may be another female in tow.

Louise reels from the news that Alik has to go back to New York, and tempers flare when Lucy discovers that Tiffany has been secretly dating Sam.

Rick Edwards presents a behind-the-scenes trip down memory lane as the reality show celebrates its 100th edition, featuring interviews with cast members past and present including Caggie, Francis and Ollie Locke. Jamie talks about his relationship weaknesses, Lucy Watson explains the best way to win an argument and there's a sneak peek at MiC The Movie

The 100th episode of the show sees Alik forced to return to New York after almost a year in Chelsea, leaving Louise to face life in the Royal Borough alone

Spencer regrets cheating on Lauren and the group heads to the country for a music festival