Interestingly, when I changed over to Broadband, I noticed that my automatic Norton LiveUpdate wasn't working any more. A couple of words with either Symantec or Virgin (can't remember which) and I was advised to check the Symantec LiveUpdate 'applet' (whatever that is) on the Control Panel. Sure enough, it wasn't 'talking to' the Broadband ISP, but after resetting it, all now works as before.
So I wonder whether there are other folk thinking that they're protected by Norton whereas in fact they haven't received any updates ever since they changed to Broadband...??