Tinsley was born in Wigan, near Manchester in March 1928 and studied at the Northern School of Music with Margaret Dillon and Ellis Keeler, and then in London with Joan Cross, Dame Eva Turner and Roy Henderson. Her debut was in 1961 as Desdemona in Rossini's Otello with the Philopera Company at St. Pancras Town Hall, London, and she also sang leading roles in early Verdi and Wagner operas with that company.[2] She joined the Welsh National Opera in 1962 and the English National Opera in 1963, specialising in operas by Verdi, Puccini and Richard Strauss.