is was the Community HIV and Aids Prevention Strategy, a partnership of several organisations led by the Terrence Higgins Trust (THT) coming together for health promotion to gay and bisexual men.
If you want the official website, it's www.chapsonline.org.uk (Update: it was – that site no longer exists and presumably all the content is no longer available.) (Update 2: it's now back in its form when CHAPS ended and 'HIV Prevention England' was its replacement programme. A huge chunk of the historical content is still missing.)
As you will see, this is not the official website.