"[3] The original church interior was designed by George Frederick Bodley (Founder of Watts & Co.), and was fitted out in a highly ornate style typical of the Victorian era and of Anglo-Catholic churches, including stone carvings by Thomas Earp, wrought iron altar rails, stained glass windows, and a carved reredos painted by Clayton and Bell.

Many of the carvings are in the form of caricature representations of members of the church congregation, the British Royal Family or the clergy.

It was dedicated as a memorial to Bishop Charles John Corfe, who founded the Anglican Church of Korea in 1890.

On the south side of the nave stands the Kelham Rood, a life-size bronze sculpture of Christ on the Cross together with free-standing figures of St John and the Virgin Mary.

It is the work of sculptor Charles Sargeant Jagger (1885–1934), who also designed the Royal Artillery Memorial in London's Hyde Park Corner, and was completed in 1929.

[6] The sculpture was originally commissioned by the Society of the Sacred Mission (SSM) for the Great Chapel at Kelham Hall in Nottinghamshire.

The sculpture then stood in the SSM Priory in Willen (Milton Keynes), before being moved to St John the Divine.

On Sundays and holy days, clergy wear decorated robes, a choir sings the Mass, and incense is used.

The Sisterhood of St. John the Divine, an Anglican religious order, is indirectly named after this church, for its foundress, Hannah Grier Coome found spiritual comfort in the parish during her residence in Britain.