Hi fellas, no I haven't done anything more on this. I have written the text of the 1956 Ampol trial, but not the '56 Mobigas as yet. I have a few raw photos and 16mm movie stills but I haven't organised them.
I have added a paragraph of the '67 Southern Cross to the VW history page, plus a different photo.
http://www.clubvw.org.au/history004
Also since this old 2009 post, all the club magazines (since 2007) are archived on the Club VW site. If you are interested in the Redex trials, download the following issues:
1953 Redex - July 2008 issue
1954 Redex - August 2008 issue
1955 Redex - 5 parts. Download Sept, Oct, Nov, Dec and Jan 2009.
http://www.clubvw.org.au/2008
There's also the story of the Redex / Ampol / Mobilgas / CAMS spat, and an intro to the two 1956 trials, in the April 2009 issue. This is as far as I've gotten so far.
http://www.clubvw.org.au/april-2009
Continuing the Ampol/Mobilgas series is on my list of things to do, but with my daughter now in year 9 with more homework than ever, VW projects seem to be taking a back seat. There just aren't enough days in the week...