The hassle with the Tax thing is that the Kiwis have to pay on the money they bring home - and if they have already 'paid UK tax', that really hurts.

Various attempts have been made to do deals between countries about this sort of game, such as 'portable tax credits' - but each govt wants its pound of flesh - the idea that a temporary worker will be able to draw much in the way of benefits (when they have gone home again anyway!) is what is pissing off the kiwis - also workers who have only a few weeks to earn a year's income will get hit really hard on a 'weekly pay tax as you go' arrangement as they get taxed on the 'weekly rate' that assumes they will get that same rate every week - when they do their return, they would be due a huge refund - which they sensibly see that they are not gonna get!!!! This is the same hassle that those on the dole have here - they lose heaps off the dole when they earn anything, and don't end up much better off for short periods of casual work.