Thanks all for the responses.
Yes, John Sneddon and a number of other BMC and Leyland historians are currently searching the planet looking for Australian car identification data. This is to help Peter Davis compile a book that's to be published this year on behalf of the BMC-Leyland Australia Heritage Group. It covers all the vehicles produced by the companies in Australia, not just Minis and Mokes.
Here's a link to some background to the book (click on the Book Announcement hyperlink) -
http://www.bmclaheritage.org.au/index.htmlApproaches have been made to the British Motor Industry Heritage Trust and other entities but it seems the numbers allocated to engines built for Australian requirements weren't important enough to retain, like other accessible company records. Of course the local factory records that would normally contain this data are long gone.
This might seem like just another attempt to create a perfect list of vehicle identifiers but given Peter's background and amazing retention of the detail from his days at BMC/Leyland this should be a more accurate version. I've suggested inclusion of a way to easily access updates to the content as more information comes to light. Currently the search is concentrated on company documents, such as technical and service bulletins.