Looks like my problem was related to the billing changes, not a Soton thing!
When I lived at my parents (5 years ago) the broadvand was in my name (phone and TV in dad's)
I moved out, took broadband with me.
Today I phoned up customer services, 45 min phone call with tech support, was told some-one had the same mac address as me! The woman then said do you know mr x y, i said yes, that's my dad, and confirmed by giving her address, and phone number. She said they'd send me a new modem, as that was easier than my dad cancelling his internet, even though I explained he doesn't have internet!
Spoke to my dad earlier, he said 2 days ago, he got a bill, which was £25 more than normal, so phoned up virgin to query it, they told him extra £25 was for his internet! he told them he doesn't have internet, so they cancelled it, thus cancelling my broadband!
So I phoned them up again, on phone for nearly 1 hr again, and woman says it's a fault so will take 72 hours to fix