Wow some great photos there.
I have just finished writing a detailed 5-part article on the 1955 Redex Trial, which was published in Club Veedub Sydney's magazine Zeitschrift. There was a lot of intrigue over the result of the 1955 Redex, with many appeals and reappeals over the result and CAMS having to override the Redex company and its directors, Reg Shepheard. Even the RAC in London got involved. The trial took 3 weeks to run but another 3 months (!) before the final results were known. Even then Redex witheld the prizemoney for another couple of months. The VWs of Laurie Whitehead and Eddie Perkins eventually finished 1-2. Redex got out of the trials business after that. In 1956 there was a breakaway from CAMS by a group of NSW motor clubs, and the Ampol Trials were not run under a CAMS permit; technically they were 'illegal'. The Mobilgas was the 'establishment' trial. It took 2 more years to smooth things over.
BTW, Volkswagens won all three Mobilgas trials - 1956, 1957 and 1958, and one of the Ampol Trials, 1957. A Peugeot won the Ampol in 1956, and a Holden in 1958.
I found a really great place to find old Redex photos was the National Library's 'Picture Australia' database. You can do a search on anything you like - try doing a search on Redex, or Ampol, or Mobilgas. Try doing a search on Volkswagen - plenty of Clayton factory photos too. The website is
http://www.pictureaustralia.org/index.html