Since 1913 the RHS Chelsea Flower Show has been held annually on the South Grounds.

Parts of the hospital were heavily damaged, with some loss of life, by enemy bombing in 1918, reconstructed in 1923 only to be destroyed again by a V2 rocket in 1945. Other damage was suffered during the Blitz and the Infirmary was destroyed in 1941.

In the Octagon Porch the Royal coat of arms was installed which had been removed from the Royal Hospital at Kilmainham at its closure in 1925.

The first televised church service in Britain was broadcast from the Chapel in 1949.

In 1955 the Hall was restored to its original purpose, and oak benches have since been replaced by chairs.

The berths were enlarged in 1954-55 and again in 1991 to their present size of 9 feet by 9 feet (2.7 by 2.7 metres).