As soon as he was on the boat sailing back to England he started work on "Ceremony of Carols". Back in England, Britten and Pears gave concerts to audiences of all kinds and took part in opera productions of Sadler's Wells Opera Company, which was having a new theatre built. On the 7 June 1945 the new theatre was opened with a performance of Britten’s opera "Peter Grimes". This opera was to make Britten into the most famous English composer of his time. It was soon being performed abroad as well as in England.