From 08:40 GMT July 5th: Regrettably, it appears that the secure server where the forum lives is currently down again.
We will get it functioning again as soon as possible, and apologise for the inconvenience.
The catalogue server and downloads are unaffected.
EDITED TO ADD: Apologies for the latest outage, which was caused by a problem related to changing DNS providers. It is now back up, and the problem should soon resolve for everyone if it hasn’t done so already.