Thanks Daryl, there are some links at the bottom of the page to other pages showing the gun works. While I'm not an urban explorer myself I've had a good look on the site. There are some stunning pics. There may be a link to North Wales hospital., it's close to where I live and it's a derelict asylum. That's how I stumbled onto 28 days later.
Sorry for going off the thread a little.

Rust never sleeps !