Hi
Go here
http://www.ntl.com/home/contact/generic/customer.asp which will take you to their generic email enquires and send them an email requesting info on the tvdrive release dates in your area. They'll probably send you the fob off email saying 'early 2007'.
If you then reply directly to this email saying that you want more info and that your thinking of going over to Sky+ (even if you not) then hopefully you'll get a more personal reply. This worked for me