Just a thought, apologies if others have mentioned this (I'm a little ******

).
If ntl are sending these letters out asking for punters to call in etc. to explain themselves then they should provide a means to monitor their downloads. Failing to do so could lead to ntl being liable to legal ramifications.
How do Mr & Mrs NonTechy with 5 kids who like listening/watching broadband Plus all day monitor their downloads. Do they really want to?
Lots of loop holes here.