Persuaded there that he should be in London, Belcourt auditioned with John Pritchard; as a result he joined the chorus at Glyndebourne in Sussex, England.
[1][2] His teacher in Vienna, Editha Fleischer, advised that he should move to baritone roles, and he unwisely made this change from 1951 with contracts in Bonn and Ulm.
He returned to Scottish Opera in the later years, including their production of Verdi's Otello in the second season, and as Shuysky in Mussorgsky's Boris Godunov in 1965.
During the following thirty years, he played many roles at Sadler's Wells (later renamed English National Opera); these included Eisenstein in Die Fledermaus and Loge in Das Rheingold,[1] as well as Herod in Salome, Shuysky in Boris Godunov, Dr Suda in Osud and Sciocca in The Violins of Saint-Jacques (creation, 1966), and he participated in the premieres of Toussaint by David Blake and The Royal Hunt of the Sun by Iain Hamilton.
Belcourt appeared in musicals, including Man of La Mancha in London's West End in 1968 and Kiss Me, Kate at Sadler's Wells in 1970.