UK1-VN (Value network) seems to have gone down a couple of times for a few minutes. This is being worked on. Updates to follow. No other servers are affected.
UPDATE (22.15): It seems that most people are in fact able to access the server. I’m unable to access the support system for the datacentre that the server is hosted at so have opened a post on WHT here http://www.webhostingtalk.com/showthread.php?t=906052
UPDATE (00:33): It seems that they are experiencing a DDoS attack, this is being worked on, please consult the link above for up to date info.
UPDATE (20th 18:12): There does seem to be some buffering for some listeners, I have been assured that the network is being worked on to get it back to full capacity.