He sang Macbeth opposite Gwyneth Jones for the Welsh National Opera in 1963 while also making his Glyndebourne début as Nick Shadow in The Rake's Progress.
He also made his Covent Garden début in 1963 who engaged him again in 1965 to sing Paolo opposite Tito Gobbi's Boccanegra and a year later he sang Marcello in Puccini's La Bohème.
In his final years, he became President of the Rushmoor Oddfellows Male Voice Choir from Aldershot in Hampshire, and in 2000 enjoyed great critical acclaim for a series of masterclasses and radio recitals in Canada.
Jones' television and radio appearances run into many hundreds and include several TV series of his own, such as Y Gelli Aur (The Golden Grove; BBC Wales) and Delme (S4C).
He also acted, appearing as Captain Cat in Under Milk Wood, and as Blind Dick Llewellyn in the BBC production of Jack Jones's Off to Philadelphia in the Morning.