OK, the old server is still around, so I've redirected DNS to it, but the wiki is in read-only mode until this is all sorted out. I don't know how long it will last before it crashes again and it might suddenly get pulled (because the rack space is due to be filled with something else)
The new server has been rebooted, and is back up again so I've switched the DNS back. The guy from telehouse said there were no messages-of-doom on the console, and it was still responding so it's all incredibly strange. (And it's back in read/write mode again).
