After a huge misunderstanding on the phone, Stacey thinks Gavin has finished with her. He drives to Wales to explain and ends up taking her home with him. Having never been further than Bridgend before, Stacey's trip to Essex is an eye-opening experience that ends with the biggest surprise of all.

After his initial angry reaction to Stacey's news, Uncle Bryn agrees to drive them all to Essex to meet the Shipmans. Pam has laid on a cracking spread and the party goes with a bang. But then Gavin and Stacey make an announcement that throws all the bonhomie out the window.

The Shipmans drive down to Wales for the wedding fayre. After an eventful trip to church to hear the banns being read, Nessa confides in Stacey her big secret.

Stacey's brother Jason arrives home early, much to Uncle Bryn's horror. Stacey has her hen night and Gavin has two stag nights, the second of which reveals something about Stacey that could jeopardise the whole wedding.

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?