1939 Register

E.D. Letter Code DFQR
Borough, U.D. or R.D. St Albans R.D., Hertfordshire
Registration District 139/2
Address Napsbury Hospital, St Albans R.D., Hertfordshire

Schedule Surnames and Other Names O,V,S,P, or L M or F Birth S,M,W, or D Personal See Instructions
60/205 Few, Frederick W Patient Male 27 Feb 1917 Single Incapacitated  

NB - Other occupants not transcribed.

Napsbury Hospital was the Middlesex County Asylum. See Wikipedia

Source: findmypast - 1939 Register RG101/1669I/012/25