Guys, I was in a similiar boat to you, Aust/UK passports etc, Aust CPL A with ATPL subjects. I dont agree that the JAA exams are HARDER. They just cover A LOT more material than the Oz syllabus. They are a strain and they require commitment. The only thing that got me through the exams was the excellent help, support and material offerred by Bristol Ground School in the UK. It's not cheap, there are no short cuts, and yes, you have to travel to England, but they are also great at gettign you through the exams. As for the ease of getting work over there, I'd say having some GA time here is a definate help.
Good luck.