The server on which this site resided hitherto recently suffered hardware failure and the site was therefore restored from backup on a new server at a different location. Between the time required for the restoration process itself and the DNS updates necessary to make the restored site visible we suffered several days downtime. Apologies for any inconvenience caused.
Looking on the bright side, we took the opportunity to update the WordPress software which runs the site and the new server is considerably better specified than the old machine so the site should be more responsive.
Unfortunately, the restoration process required a reset of all MailMan passswords, so if you wish to unsubscribe or change your preferences you will need to request a password reminder from MailMan.