When recently returned New Zealander Lara Barclay talked to fellow Kiwi expatriates in Australia, it was her country’s success in tackling coronavirus that came up again and again and the crisis role of prime minister Jacinda Ardern.Support from New Zealand’s million-strong diaspora – equal to a fifth of the country’s resident population – could prove a surprise boost for Ardern as the Labour Party leader seeks re-election at an October 17 poll.“They thought New Zealand’s response was fantastic…