That's a pity, hope he's archived it somewhere.
Cornwell's site was wide-ranging, although Cybergibbons' site about Cane Hill was arguably the first. Personally I felt Mechanised was the most original of the asylum exploration sites - very personal, detailed and subjective with photos shot in a very different style to the dynamic composition/ wide-angle approach most of us have adopted.
When UE first turned up on the web in the mid-2000's, most of the active explorers had personal websites, then everyone gradually moved to Flickr, and now Facebook. Credit to those like Flat4 & Sectionate, Tumbles and Lillimouse who have kept their own sites going. All the way through I've intended to build a site, but never have done and now with 12+ years of photos, it seems like a huge undertaking …