Alan finds it hard to choose his best man. Caroline and Gillian discover they were born on the same day. Their respective birthday celebrations descend into emotional chaos when Caroline and Kate are outed by John.

Gillian and Robbie grow closer while Alan calls the wedding off, in an emotional conclusion to the series. But can Celia rise to the occasion, face her demons and get Alan back?

As Alan and Celia seize the day, Gillian finds herself spiralling into a dark place as skeletons surface. Caroline's fractious relationship with John leads her to rethink living arrangements as she makes a bold decision involving Kate.