The Catholic Directory, Ecclesiastical Register, and Almanac described the school as offering a "continental education".

These nuns also played a role in the founding or development of other Catholic schools in Isleworth and the present-day borough.

In 1922 it became St Mary's College, the first Catholic school in Middlesex to be recognised by the Board of Education.

John Gumley Senior's eldest daughter Anna Maria and her husband William Pulteney, 1st Earl of Bath lived at the house for a period, during which it played host to famous figures of the time including poet Alexander Pope, writer and politician Joseph Addison and future Prime Minister William Pitt ("the Elder").

After the death of their mother, the house's ownership eventually went to Anna Maria's younger sister Laetitia, wife of the general Lord Lake.

It changed hands a number of times before it was bought by Marie-Madeleine d'Houët, founder of the FCJ.