Sorry, GUys and Gals!
It actually was something simple like 'I forgot to renew the domain name!"
There's actually some maintenance to do on the board I need to try to do when I have a few hours with a clear hear. (Yeah, like that's likely to happen!)
Thanks to to Rob and Monsieur Paul for keeping things running.
It wasn't a money problem, just some dumbarse didn't notice the domain was expiring, and didn't jump on it fast enough for it to be 'seamless'.
Pete