There would be very few Australians who detect that R is English born by his voice or accent but there is at times an English 'O' vowel sound that I pick up on.
Likewise for Kiwis from New Zealand. They will speak perfect Australian until there will be a strange vowel sound that gives them away as being from our little islands to our east.
Former NZ Prime Minister Helen Clark had quite a broad Kiwi accent, but now as a VIP at the United Nations, her accent has changed and is much more worldly (acceptable?).
The further you go south in New Zealand, the broader the accent will become and with some very strange vowel sounds. By the time you get to the south of the south island, they are speaking with a Scottish accent. But having visited New Zealand last year, I think the broader accent is disappearing, as are regional accents all over the world.
This is a good play on the Kiwi accent. Yes, vulgar but a bit amusing.