Phil,
Thanks for that advice you have actually answered and clarified my question. I had assumed that my license would expire but also being an oldie (CAA rather than JAA) my license does not expire only my certificate of experience.
This has relived me somewhat as I do not have to go through all of the hours, medicals etc in the UK. I will certainly upgrade my license on my return to Australia and get airborne once again. As you state the exam and check ride is all that I will need to get my ticket here in Oz.
Once again thanks to all for the advice and help.
From one happy PPL