Here’s the relevant bits of the email I received after speaking to NTL’s customer service dept.
==================BEGIN MESSAGE==================
Dear customer,
Thank you for your enquiry to the ntl Broadband technical support centre
on 19/04/2005. To help us improve our service we would be very grateful
if you could answer the following questions and return this to us.
<questions snipped>
Reply to this mail
Please do not reply to this email, unfortunately, any replies will go
unanswered.
<snippage>
===================END MESSAGE===================
Someone just shoot them!