This is first mentioned in an 1895 directory as being at 89 and 91 London Road with the Misses Martha and Louie Addenbrooke as Principals. By 1899 they were assisted by 'efficient certified governesses and professors'. They also offered 'a separate bed for every resident', which had not always been the case in some earlier 19th century schools. The school seems to have specialized in music and prepared pupils for Oxford Local, Royal Academy of Music, Trinity College (Music), South Kensington and London Matriculation examinations.
By 1920 the school was being run by Mrs H. Pierce Hamilton as a boarding preparatory school for girls and boys. From 1923 Miss Amy E. Reid was Principal of the school and by 1935 it was appearing as the High School for Girls under Miss Reid and Mrs Vipond. It was a private boarding and day school, which also took weekly boarders and had a kindergarten. It also offered music, arts and secretarial courses, had its own playing fields and offered horse riding. In 1939 Miss V.F. Carleton was the Principal and by 1955 it seems to have become a day school with 130 girls aged from 6 to 17.