SaintRef

....But what are the advantages?

Not true. UK Visa is not required for Australians for a tourist stay of up to 6 months....

Good point, and fortunatly I have already obtained both passports for my kids. Don't want to deny them any opportunities.

Aussies don't have problem entering Europe, and once in they can move freely...

Saves me money renewing a passport I'll rarely use...

Permenant Resident here. Very happy in Oz, with no intention of returning to the UK other than a holiday. I've done my time and have now applied for Australian Citizenship, which I will have shortly. My question to the forum is, what is the advantage of keeping my UK passport valid, once I have my Australian passport? An Australian passport is as welcome in pretty much all the same countries as the UK (Brazil is an exception, but any others?), so why keep both? Your thoughts...