All, we have someone new who is doing some Forum maintenance - so if you have had emails from the forum as I have, don't worry (!) and apologies if you have too many!
Well the forum had been failing to send emails for quite some time. This was filling up the error logs and building a backlog of unsent emails. Left as it was, it would have filled the disc partition. It's all been flushed now so only new emails should be sent now...