Andrew Everard:
Ummm, no - go for the new box, obviously...
In all probabllity the people phoning about the warranty renewal thing aren't in touch with the Pace box-swapping people, or could even be an outside company trying to sell you a third-party warranty.
Yesterday, having had the Sky engineer here most of the morning fighting a strange incompatibility problem with the box he was trying to install in place of my flaky Thomson, I had a phone call from someone asking if I still had the Sky service and if I was happy with it and was still subscribing and if I'd had any problems lately.
Left hand, right hand...
I had a very similar call last week and came to the conclusion that it was actually a "phishing call" to find out whether or not I had a Sky box. Given that Sky claim that they don't pass your details to third party "warrenty" suppliers I was very surprised that I got several approaches about extending my warrenty shortly before the original one expired. I then remembered a phone call that occurred shortly after I had my HD box installed in which I was told that my warrenty was about to expire. I foolishly replied "Don't be so stupid I only got it last week". If anyone contacts you asking about your Sky service just say you don't have one, it won't be Sky calling you.