The Players are the "The Porthcawl Ukulele Bandits"

The Porthcawl Ukulele Bandits are a tight 6-piece performing band (one was missing on this occasion), which features harmony, backing vocals and additional instruments like bass, Cajon percussion, melodica, accordion, mouth organ and mandolin (Taken from their publication)

They certainly have a most unique sound with unusual renditions of well-known songs.