Right, back from the basement and I can report, definitively ('appen).
We have enabled, apparently, certain inactivity-based settings which involve timeouts. There are other options but these are 'more space and processor intensive'. We do have monthly limits for the website and we currently have a fairish margin of comfort in spite of the abrupt upsurge in usage. But at the moment we don't have much idea how the forum will develop (or not). For this reason I think we'll stick to the timeouts.
Later on we may need to increase bandwidth - perfectly possible. But not for the moment. Make sense?
[Thanks, DB I wonder if you have to be logged in to do that?]
Sounds fine, ff. I'm sure the last thing we want is to get you into trouble!