Whilst Stacey is thrilled to be living back home Gavin tries to come to terms with the culture shock of working with his new Welsh colleagues. Nessa, now living with Dave, throws a christening party for baby Neil, attended by the Shipmans and Smithy and Rudi and their narcoleptic mother Cath. Bryn's lusty singing at the church inspires Pam in her desire to be on 'Britain's Got Talent' but Smithy, having paid for the christening, is annoyed to learn that it is doubling as Nessa and Dave's engagement party. Gavin and Stacey, however, are inspired by the occasion to ...
Despite a savage dummy interview from Bryn Stacey gets a job as a waitress as Marco's cafe. Dave Coaches is not happy when Nessa and the young Shipmans take baby Neil to Essex but cuts his losses when Nessa's father offers a weekend watching porn. In Billericay Pam and Mick order a huge Indian takeaway for the family and a surprisingly quiet Dawn and Pete. Stacey wants Gavin to slip away from the party and make a baby with her but he gets drunk and passes out. Next morning Nessa and Smithy wake up in the same bed.
After agreeing to build Pam and Mick a conservatory Smithy joins his mates for a lads' weekend in Barry, staying with Bryn, who goes clubbing with them in Cardiff and ends up being sick. Stacey and her friends link up with the boys, Nessa telling Smithy the date of her wedding to Dave Coaches. Stacey however is perturbed at her continuing failure to get pregnant, especially as she has stopped taking her contraceptive pills.
Pam and Mick unexpectedly arrive in Barry, and everyone (including Smithy and Doris) decides to spend the sunny day on the beach. But there are two questions on everyone's mind: will Dave be there, and is Gavin really okay?