[2][3] The term had largely fallen out of favour by the 1920s and was made obsolete in law by the Mental Treatment Act 1930.

The hospital had been in planning since 1906, and by 1917 it was largely complete; however, the outbreak of war postponed opening until 1921.

[1] The site had extensive boiler houses and plant rooms, a large laundry and a substantial water tower.

[1] There were also large kitchens located behind the canteen and a substantial recreation hall or ballroom (the latter suffered an arson attack on 30 September 2003 and is now a burnt out shell).

The hospital was also once served by the Horton Estate's own railway but this was removed in 1950 and no trace remains except around the central engineering block.