Helen, Countess Tasker, a benefactor of several Roman Catholic church and school projects, gave £4,000.

[2] From the beginning, Holy Trinity served a growing Catholic community in the area, initially boosted by the Irish mass migrations to Great Britain.

In 1862 a school for girls and infants was built behind the church to designs by Joseph John Scoles.

There is a sizable French-speaking population because the church is near the Lycée Français Charles de Gaulle in nearby South Kensington.

[4] It is also used by the Syriac Catholic Church, who hold Mass here in Arabic and Aramaic on Sunday afternoons.