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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, UK and Australia has different implementation methods of the DVB -T for digital TV broadcasts. UK uses -T2 encoded with MPEG-4 AVC (High Profile Level 4) while Australia uses -T format encoded in MPEG-2. With this, the tuner module responsible for the actual processing of the TV signals is hardware limited to 1 or the other technology but not both. A UK digital TV tuner would not be able to recognize Australian TV signals.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.