- Do not forget ground school/theory exams - check these out in LASORs as well. I did not have to do the full set of exams again when I came back to UK but not sure what rules apply if you do not have a PPL already from Australia.
The situation in this respect is pretty simple. Unless you hold a full ICAO PPL, except for the flying hours, nothing is transferable to count towards your UK-issued JAR-FCL compliant PPL.
So in any case you will have to do all UK ground exams plus the R/T practical once you arrive in the UK.
Because of that, it's wise to start studying while in Australia, but it does not make a lot of sense to do exams there. With one exception: if Australian law requires a pre-solo exam (like the FAA does) then you need to do that, obviously.