Many thanks to all, the replies have been extremely helpful. I can see pretty clearly what the requirements are for an Australian GA pilot and have emailed Mick to find out if the same would apply to an oversees pilot on a CoV. I have no idea if it is a question that has been asked before.
If the doors of recreational flying are not open to me then I still plan to fly by hiring a GA type such as a 152 or a Worrior and, if it turns out to be practical, I may still be visiting some of the airfields populated by RAA pilots on my travels.
As I have said everywhere I have posted, if there is anyone out there who fancies joining up for all or part of the trips I'll be doing you will be more than welcome, in fact I would be grateful of the company, the experience and the local knowledge.
As for the aircraft I currently fly in the UK, it is a Bulldog which is a type used by the Royal Air Force until only relatively recently to train all millitary pilots through the first stage of their flying. Ours has been repatriated from Ghana. It is a stable touring aircraft and just about competent for aerobatics (as I am finding out) if a little heavy for all but beginners competitions. Basically it has fantastic visibility, handles like a classic and is just different enough to stand out from the plethora of Cessnas and Pipers filling the sky.
Safe flying.
-JT