A friend of mine who works in a shitty job reports that her boss is openly threatening to fire anyone who does not vote for National. This is of course illegal - it violates s 22 of the Human Rights Act 1993 (which outlaws discrimination in employment matters, political opinion being a prohibited ground of discrimination in s 21 (j)), not to mention s 218 of the Electoral Act 1993, which bars "undue influence", both physical and financial. And it is exactly why we have the secret ballot - to ensure that people can vote for the government of their choice without being subjected to retribution and victimisation by those with social or economic power over them.
Anyone subjected to such threats should contact the Chief Electoral Office on firstname.lastname@example.org and lay a complaint. Threats and economic intimidation have no place in a democracy, and those who use them should be punished to the full extent of the law - no matter which party they are pushing for.