I’ve been sent a link to a scan of the second edition of the Official Book of Ultima. For the most part this is the same as the first edition, but it has solutions to the games that were released between the two being published. I’ve added this to the downloads here for anyone interested. Thanks to xyzzy for the link and to whoever did the scans in the first place.
I’ve been struggling to find any spare time recently so I’ve not even looked at Terra Nova yet. I have added scans of the 11th Hour Guide though.