I used to live in St Albans, Hertfordshire and grew up in the knowledge that we had many local hospitals for the mentally ill and, as they were called then, the mentally handicapped. There were five local to me: Napsbury, in London Colney Leavesden, near Watford Shenley Hill End Cell Barnes If you find that you have London ancestors who were enumerated as Imbecile or similar in the censuses, it is always worth checking the hospitals in the surrounding counties if they go missing in later censuses. St Albans was a popular place as there was a very good railway link to and from London. This also applies to other areas outside of London. Sadly, many had the attitude that the inmates were far enough away from their families in London to not be an embarrassment, but close enough to visit.