Just an update on how things panned out so that other Australian trained psychologist can have some idea of what to expect.
A recap- I applied for HCPC registration from Australia in Feb 2013. I didn't hear back until July 2013 and they requested more information about my experience with Learning Disorders. Since then....
So I sent of a copy of almost all that i had read at university and a log of all LD clients i had worked with and crossed my fingers. I took the gamble and decided to move to the UK irrespective of my HCPC registration. So I had been looking at research work to get me through because i was expecting to be told that I would need to do an additional placement with LD down the track. However, HCPC got back to me towards the end of September and told me that I could pay the fee and be a fully registered clinical psychologist in the UK. A huge relief. So now i can return to doing what i love doing, psychotherapy as apposed to full-time research. I hope to return to part-time research when i'm ready though.
Each international application is different and we have all had different experiences, so just because i managed to get through doesn't mean that everyone from Australia will. Nevertheless, my advice is to apply from Australia, send of literally everything you think might be relevant and expect to get a letter back in 6-8months asking for more information about something. Again, send off everything you possibly can that you think is relevant and hope for the best. Then wait to hear back again, 2-6months. Then make your decisions about getting HCPC work or another placement/whatever they require of you to get HCPC registration. The gamble to move to the UK without HCPC registration luckily paid off for me, but it was tied with some anxiety on my part. So i'd recommend staying employed in Australia until you have your HCPC registration.
Anyways, good luck to all fellow Australians wanting to practice in the UK.