I never was a fan of Gavin & Stacy but two characters stand out for me and they are both Welsh. Ruth Jones as Nessa and Rob Brydon as Bryn.
As a great part of my extended family live in South Wales, we know the area quite well. Barry Island? OMG :o)
As for Harry Enfield. His work speaks for itself. Apart from the first series of Men Behaving Badly…….he was so badly mis-cast. IMHO.
Oh. And my other sis-in-law (married to my brother) is a Billericay girl. Sheesh!