found this advert in the 'Croydon Times' dated 19th September 1958:
“Personal Listening Hoods, Soundproof rooms equipped with Stereophonic apparatus, A comprehensive selection of over 10,000 Recordings * Our staff have been specially trained to be able to give you every assistance and service. GRANTS - High Street, CROYDON.”
… and this advert in the 24th October 1958 edition:
“SELECTION OF RECORDS in the RECORD SECTION you can make your selection from over 10,000 Recordings! You'll find acoustically designed personal listening hoods and special sound-proof rooms equipped with PYE STEREOPHONIC apparatus to enable you to fully appreciate the magnificent reproduction of this advanced recording technique. GRANTS - High Street, CROYDON.” Gave Harwood (2024)