[1] In October 1880 Prince Arthur, Duke of Connaught and Strathearn laid the foundation stone for a purpose-built hospital at Mount Vernon in Hampstead.

[3] The hospital, which was designed by Frederick Wheeler, was arranged as a sanatorium with the wards following a semi-circle shape either side of a central staircase.

[5] During the First World War, soldiers were treated at the Mount Vernon Hospital and, in 1932, the Central London out-patients department moved to Riding House Street.

[3] In 1957, the Gray Laboratory was established and, in 1967, the Marie Curie Hospital, which had been providing cancer treatment from premises in Fitzjohn's Avenue, also moved to Mount Vernon site.

In October 2019 a group of experts reported to health leaders that, due to dilapidated buildings, obsolete equipment and a lack of staff, patients were unsafe and the quality of care was uncertain.