Just was wondering folks i live in the UK and was intrigued as to why P&O (Australia) never offer up a World cruise?

Even the Chinese have had a WC on Costa Atlantica in the last few years that seemed popular, and i know the Australian Princess based ships do them to why not P&O?

If anything you would think eventually most people would have covered the South Pacific Islands and New Zealand and would be looking for new horizons to explore?