Sing While You Work came to an end.
The P&O choir took the top spot ahead of teams from Cheshire Fire and Rescue Service and bankers with multinational firm Citi in the final of the programme presented by choirmaster Gareth Malone.
The final of the eight-week competition took place at Ely Cathedral, Cambridgeshire, where the choirs performed a new piece by composer Paul Mealor and lyricist Brendan Graham.
Having practised intensely for six months, they were challenged to interpret the music in their own way, with P&O judged the best, although City were praised for their gospel-style rendition of the piece.
The performers were backed by the Ely Cathedral Choir and had to impress a panel of judges. The series began with five choirs, but those of Sainsbury's, and Birmingham City Council were eliminated earlier on.
Fans took to twitter to give their own reviews on the show, with one saying: "Well done P&O and Gareth Malone. Excellent series!"