The forum is now back up and running.
It has been restored from a backup we had dated 27th June 2006.
So unfortunately any posts since then are gone for good. :(
It has been a right nightmare trying to restore it to the 27th June backup!
I don't quite know what happend myself, but it seems the site went down on the 20th September due to a server move, then came back up and the forum was missing posts between March 19th 2006 and present.