[1] Construction of The Fairfield Three Counties Asylum by William Webster on a 253-acre (1.02 km2) site between Letchworth, Arlesey and Stotfold commenced in 1856.

The Fairfield Hospital was designed by George Fowler Jones with the longest corridor in the United Kingdom, at half a mile long.

Its aim was a more liberal way of helping people with mental health problems, by removing them from impersonal, often Victorian institutions, such as Fairfield Hospital, and caring for them in their own homes.

[3] The main building with its water towers is Grade II listed, the façade having been restored and its interior being converted into flats and a health club and renamed Fairfield Hall.

[4] My Turn to Make the Tea, the 1951 semi-autobiographical novel by Monica Dickens, features Fairfield Hospital as the Northgate Asylum.