Hi Frank,
The difference is the standard for the tunner. They use PAL I in England for example while they use PAL B/G in Australia.
So if you've got a TV card or an external plug for your notebook, you have to check that it's compatible with the Australian standard. Sometime it's not: for example I got a WinTV-USB that works for France, but unfortunatly not in the UK where they provide a specific model (they've got one for North and South America - NTCS, Continental Europe - Pal B/G and United Kingdom - Pal I).

If your card say something like multistandard PAL B/G/I, it will work fine.

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