Gareth Malone's exciting new singing contest to find Britain's most entertaining, undiscovered, amateur choir continues. This week, Gareth is on home turf as he scours the south west of England for a third regional champion to put through to his nationwide contest. Pit stops include hay barns, harbours and a high tea, on an audition tour that features a Bristol sea shanty band, a cake-loving WI group, a Guernsey church choir and some tuneful young farmers from Devon. To top it all, Gareth umpires a Pitch Perfect-style song battle between Exeter University's two top a cappella acts. But who from among these hopefuls will Gareth select for the sing-off? Success at this sing-off will secure a place in the national stages of the competition, but also comes with a challenge - ahead of the national contest, the winning choir must work with Gareth to pull off a performance in their home town.