There is a third option. Go to the US on an M1 visa and get your FAA private. Convert to an F1 and stay to become a CFI. Build flight hours while you study for the CAA exams. After 1500 hours you'll be eligible (as an Australian) for an E3 visa which can get you into a US airline. A few thousand hours of jet time and you can choose your job in the UK. You're lucky, your parents have done 90% of the work for you!