Just to clarify I have this correct.
If I purchase a property for 600k and rent it for 5 years and then live in it (as PPOR) for 15 years, after the 20 years I sell it for 1.2m. I'd have a capital gain of 600k, of that 600k I pay capital gains tax on 25% of that 600k, so thats 150k I pay CGT...