First and foremost, get your Australian ATPL completed.
Licensing authorities will only "transfer" licences, not exams.
To convert, as stated above, you'll need to do the 14 JAA exams.
Best recommendation is to do it via Bristol Ground School & distance learning.
The UK CAA has published a guide called "LASORS". Download that and read it to your heart's content. (It's great for insomnia too
Assuming you'll pass the medical, after the exams, next thing is the flying.
You have a choice of either paying for a type rating and conducting the LST with a CAA observer (expensive option) or doing the piston flying for the CPL and IR. I did the former as I already had 500 hours multicrew and could get an ATPL straight away.
Interestingly, Virgin Blue etc are recruiting at the moment. In the UK, pretty much the only recruitment is for those who are willing to buy their 6 month job...
However, by the time you finish all the exams etc, plan about 2 years, the market will be (hopefully) much better.