You may have read this post on my issues with Sky Customer Services.
Well to confirm some of the technical points I gave their Tech Support guys a ring.
The guy on the other end of the line was clueless.
He didn't know what a MAC address was, he didn't know that ADSL required a username and password... generally I have never talked to someone less capable on a technical helpdesk.
Only this could be worse (20 minutes of pain).