Choirmaster Gareth Malone continues his mission to get some of Britain's busiest workplaces singing.

This time he travels to the Midlands to set up the final choir in one of the country's largest water companies, Severn Trent Water. Once formed, the choir will sing against three other workplace choirs as they compete for the chance to be crowned Gareth's Best Workplace Choir. With over 5,000 call centre staff and over 500 workmen, dealing with everything from raw sewage to finding leaks, finding 30 people to make up the choir appears easy. But as staff are struggling to juggle family commitments and busy work schedules, things aren't plain sailing and Gareth begins to feel the pressure. Show less