One anecdote from this evening - which I spent with friends from the UK who'd arrived here from the UK to work on the Chch rebuild. They have two adult children living in the UK, both educated young working professionals. Both sent message independently tonight - they're moving to NZ ASAP as they no longer wish to live in a UK out of Europe. They will get NZ residency - UK's loss, NZ's gain.
Sounds more like a knee jerk reaction, when potentially nothing much may happen as a result of this. Moving to NZ is a huge step, and the exchange rate won't be good for them, due to the pound being so weak. NZ has it's own problems too, and they will find buying a house in NZ very expensive compared to earnings.