[1] The hospital was built as a memorial to members of the Portsmouth Division of the Royal Marine Light Infantry based at Forton Barracks who had died in the First World War.

[7][a] On 20 June 2018, after an enquiry which took four years and cost £14 million,[8] the Gosport Independent Panel published a report which found that 456 deaths in the 1990s had "followed inappropriate administration of opioid drugs".

[9] Assistant Chief Constable Nick Downing, head of the Serious Crime Directorate for Kent and Essex Police, announced on 30 April 2019 that a new criminal investigation into the deaths was to take place.

[11] There are four in-patient wards with a total of 70 beds, offering rehabilitation or caring for older people with acute mental health needs.

[1] The minor injuries unit, operated by Portsmouth Hospitals University NHS Trust, was upgraded to an urgent treatment centre in 2021.