Preparation and testing took longer than intended and the actual transfer work starts this morning (Tuesday) and is expected to take up to 48 hours to complete.
It is possible that there will be a period when this site generates error messages but I will endeavour to keep this to a minimum.
The server upgrade is now complete. Apologies for the short outages that occurred and also that for a period of about an hour the server was not sending out any notifications that you may have set up.