Anyway, yes...

[chaletian]

Well, I had an e-mail from the hosting company saying that the only thing to do, other than upgrading to a dedicated server, was to switch off load-sharing thingy (that spreads server usage over several servers) and then switch it back on, in the hope that chaletian.com would be spread over servers that weren't so busy this time. Unfortunately, larking about with the server options plays merry hell with the site actually functioning, as it doesn't know whether it's coming or going.

I'm hoping this will sort itself out in a few hours. If it's still dodgy in the morning, I'll email the company again.