BT have joined the club
My BT internet service is filtering the Virgin Killer page, although I can see it through anonymouse and the https wikipedia site. However, in response to a complaint, this is the answer I got (complete with their spilling mastikes):
I am sorry to learn that you are not able to access the individual pages at Wikipaedia. I do understand your concern and will try my best to resolve the issue for you.
First, I would like to inform you that BT has not censored or blocked any website or pages. We do not have the authority to block any sites. It might be some temporary issue hence I would advise you to perform the steps below and check the settings. You can also use a different browser (Morizilla fire fox, BT yahoo browser) and then check to access the Wikipaedia.