Just adding to the info on St George's Hospital.
Once called "Northumberland County Lunatic Asylum"
The National Register for Archives, within the National Archives site has a register of nearly 300 separate records on St George's, with reference numbers, many shown to be lodged at Northumberland County Record Office ( now within the set-up called Northumberland Museum, Archives and Country Park, at Woodhorn.)
And on line are admission etc register for men from 1890 to 1898... showing name address, marital status, age etc.
And also a list of some female admissions.
The site also lists holdings for Northgate Hospital 1916-1960).
Michael Dixon