Apologies to all those suffering problems due to the outage - it appears that we also had DNS problems that were only fixed this morning, and those were causing problems with web and outgoing mail. Web is now fine and the outgoing mail queue is currently being processed - should all be through within the next few minutes.
Oh look, we're back here again. (Well done on remembering this blog. I'm certainly glad I did.)
It appears that a major power cable's been cut in the Fulham area and thus the whole of Mailbox's Fulham hosting center is down. No word on any timings for things coming back up, but as soon as we hear anything, we'll put it here.
Update, 4pm: We're back! That was quick - cool!