Start with this one:
Two for the Road | Horizons Unlimited
(Incidentally - when I did a search on the exact title, it didn't come up as a "result". It came up number 11 in the display under "Browse books in this category". When I tried to sort the results from the default of "Newest" to sort by "A-Z", it cleared the search and displayed all 1000+ books )

The missing links:
https://itunes.apple.com/au/book/two...58358097?mt=11

Two for the Road | Aussies Overland - The Adventures of Brian & Shirley Hardy-Rix

http://www.amazon.com/s/ref=nb_sb_no...rley+Hardy-Rix

I'll work on getting links to all the other audiobooks in my arsenal and email you the links.

Done thanks!