To tell the difference between an Australian and a New Zealander just ask them to say 'fish and chips'. If they say 'feesh and cheeps' they are Aussie, if they say 'fush and chups' they are Kiwi. When I visit Australia, they think I am English. People from Perth actually sound more like New Zealanders than people from Sydney and Brisbane do even though its on the other side of Australia. In general we do not have regional accents in New Zealand other than in Otago and Southland (the lower half of the South Island) where they roll their R's strangely. This has nothing to do with British accents, but I find the whole subject fascinating.