Just an update -- Lancashire Archives have confirmed they have Registers and Case Book Records for Lancaster Asylum.
I have to complete a form requesting these and they can then give me a quote for the copies - I have, of course, just requested such a quote.
(Let joy be unconfined!!)
lancsann - I hadn't known about mercury causing madness - and must confess I don't know of the Asylums around Manchester. I am ashamed to say I didn't even know that areas of Manchester were hat making centres!