Traditional Welsh Male Voice Choir

For years my Mum has wanted to go and see a proper MVC in concert - it's her Birthday soon and I'm thinking about making a weekend of it, but I have no idea who the best MVC in Wales would be in order to arrange it.

For avoidance of doubt (and having asked gentle questions lol) she's thinking along the lines of the choir in Twin Town - singing things like Men of Harlech, rather than everything being sung in Welsh

Any thoughts from those in the know would be gratefully appreciated!