The series finale sees Darren betray Ollie with severe consequences. Ollie must also contend with the possibility that Emma may not be the perfect girlfriend he thought she was.

Ollie is unable to celebrate his birthday when he is dropped from his Saturday league football team before an important tournament. Liz gets carried away on a date with a younger man.

Ollie inadvertently arranges a date with an old flame, Emma discovers that Tony has managed to get a date of his own and Darren is left alone to work for a client with whom he shares a bitter past.

When Darren fails to turn up for work, Ollie, Liz and Tony must investigate his whereabouts, unravelling an action-packed mystery - which leaves Emma to deal with Ollie's move into his new flat by herself.

Ollie suspects Darren of moonlighting with a rival firm and hires a new assistant. Darren soon finds himself in way over his head. Meanwhile, Emma quickly wangles herself a promotion at work.

Ollie swaps the job book for a fancy new phone app, which soon lands him in hot water. Tensions between Emma and Liz rise, while Darren struggles to come to terms with fatherhood.