On his way back from another work trip, Murray hears that his beloved wife Bex might be leaving him on the day of her 40th birthday. He desperately tries to find her before the surprise birthday party he's arranged gets underway.
Murray and Bex reluctantly break the news to their friends and family that they are separating; Bex's father, Don, takes the news particularly badly; Bex joins Abby's book club in an attempt to embark on her exciting new life without Murray.
Murray decides to support Bex by helping her raise as much money as possible for the charity event that she is organising by selling tickets to his friends and family and arranging a celebrity appearance for the evening.
Bex agrees to go for dinner with Murray at Lorenzo's, the Italian restaurant where he first proposed. However, a series of unfortunate incidents scupper his big plans for the evening.
Bex moves in with her sister Keeley; Murray makes a big decision about his future; Bex and Murray try to decide who should have custody of their dog, Barney.
Murray tries to clear things up with his colleague Emma and decides that he needs to give it one last push with Bex; Bex's sister Keeley has a massive decision to make about the future of her relationship.
Ben Miller
Murray
Caroline Catz
Bex
Kenneth Collard
Grant
Kate Miles
Tamzin
Abigail Thaw
Abbie