The wedding day has finally arrived, but will they go through with it? Will Uncle Bryn finally admit to what happened on the fishing trip and will Nessa do what she knows she must?

Stacey and Gavin are still in conflict over where they should live, with Gavin refusing to even consider the idea of living in Barry. Smithy admits to Gavin that he had another fling with Nessa and realises he's going to have to face her again at the surprise party Bryn is throwing for Gwen. Bryn is panicking because he wants to keep the surprise barn-dance themed party a surprise…but he's also having trouble getting enough people to attend.

Gavin seeks counselling for his marriage troubles from Smithy, but Smithy’s idea of relationship therapy is to organise a surprise lads night out at a nightclub foam party. While the lads are knee deep in foam, Stacey is with her family at a bingo night.

As Nessa and the Wests head to Essex to spend Christmas with the Shipmans, Gavin and Stacey have a startling announcement to make.

Nessa and Dave's wedding day approaches. Gavin hears some life changing news from his wife. Bryn and Jason finally deal with their secret. Smithy wishes Nessa all the best as she prepares to get married.

The families get together once again for Christmas. Bryn is cooking dinner, Dawn is in shock, and there are revelations in the pub on Christmas Eve.

It's been five years since Nessa went down on one knee, declared her love for Smithy and asked him to marry her. A lot has happened since then... catch up with the Shipmans and the Wests and maybe find out what exactly did happen on that fishing trip. As we journey to Barry and Billericay for the very last time.