Gordon Brown’s gaffe after speaking to a former (now very much so) Labour supporter is all over the UK news; the whole interview is interesting, illustrating how traditional working class voters who historically voted Labour are now motivated by identity politics, not class politics. They may support left-wing economic policies, but culturally they have nothing in common with Labour and everything in common with the Conservatives: fear of youth and immigrants, hatred of beneficiaries etc; they’re on low incomes and no longer unionised, they have many views that Labour MPs find repulsive.
Obviously the same pattern repeats itself in New Zealand: Ministers like Collins and Bennett are an especially powerful tool for National in capturing what used to be the working class. Labour has no one that can even speak to this demographic. I think Goff’s counting on a resurgent Winston Peters to win many of these voters back in 2011.