The local records office may have details
One of my relatives died in the lunatic asylum in Leicester and Leicester records office were able to give me the details of when he was admitted, from where and by who, as well as his records from his years in there (4 years) from admission to his death, details of what he died from and a photo - I think it was about £15 to get them sent to me on disc
But they told me that they had something for nothing (so had the exact date of death given to me - as hadn't got death certificate at that point - his home address etc for free)