Just a note folks, the server housing surl.co.uk, avantbrowser.com, forum.avantbrowser.com and it-mate.co.uk amongst others, is unreachable at present. I'm trying to get through to the host to find out what's going on as I can't reach Anderson (servers owner) at present.
Checking a few other IPs on the same /24 suggests this may actually be a problem internal to the superb.net network. I'll update when I know more.
Servers back up again. Still no idea what happened though as I was stuck in a queue :o(