There are lots of WoW text adventures on eBay at the moment... priced very high, £60 or offers... but there are quite a few "missing in action" titles in there, if anyone has deep pockets and wants to preserve them!
(on a related note, I recently put together this collection of advertising & information about late 1980s & early 1990s homegrown UK text adventure companies, which includes quite a few Amstrad publishers...
http://8bitag.com/info/homegrown-adventure-companies.html (http://8bitag.com/info/homegrown-adventure-companies.html) )
Hey, that's a lovely page you've made... :)