Aus CPL(H)
Australian license is 105hrs but rarely acheived with 105hrs. If you return to the UK with 155hrs and an Australian CPL(H) you will need to do a 30hr modular block and skills test. If you return with 185hrs with 50hrs PIC you can do a skills test. Both routes require ATPL(H) theory exams 14 in total. Usually a few hours are also required to get aquainted with the area and radio procedures.
If you have 155hrs on return to the UK and an Australian CPL(H) with required dual i.e xcountry, nav, night etc you can easily obtain a UK PPL(H) just a law exam and skills test. Then build your hours at your leisure, keep yourself flying and build towards your exams.
Just my tuppence worth!