FJSteve, thanks for your advice. I am purchasing this car privately and have asked the owner to confirm if it is still covered by warranty.
It is currently being checked over by my mechanic before it all gies ahead anyway.
Also, I did ring the 1300 number in the pds, and they said I should be able to purchase the extension even though I am not the original owner. So I guess that's a win
Just have to work out now if I want to fork out the money.