The house was then subsequently used as the original building of the Queen's Hospital (later Queen Mary's Hospital), Sidcup, developed as the First World War's major centre for facial and plastic surgery, largely through the efforts of Harold Gillies. Opened in 1917, the hospital and its associated convalescent hospitals provided over 1,000 beds, and between 1917 and 1921 admitted in excess of 5,000 servicemen. The original hospital closed in 1929, re-opening the following year under the management of London County Council.