I found this classified advert in the 'Leicester Daily Mercury' dated 17th July 1974: “OPUS 67 record specialists require a young lady school leaver to train as record shop assistant. Knowledge of classical music an advantage.”
… and this advert in the 14th October 1975 edition: “OPUS 67 Queen’s Rd Leicester and at Haymarket Shopping Centre, Leicester. Telephone 26465.”
… and this advert in the 14th October 1975 edition: “OPUS 67 Queen’s Rd Leicester and at Haymarket Shopping Centre, Leicester. Telephone 26465.”