I'm on dialup posting this.
I wouldn't be posting this if Xnet's support lines were actually live.
Ring any of their numbers at the mo (it 10.48am Easter Sunday sure) and ALL OF THEM HAVE THE BUSY TONE.
080014XNET 0800123456 0800123123 etc etc
According to my router, it's had a 'auth failure' and all the IPs are on 0.
It was working fine an hour ago.