History suggests the new NZ government’s pledge to cut budgets and jobs in the public sector will cost more in the long run – and damage morale in the process.

An inquiry found the Home Affairs secretary used his position for personal advantage, gossiped disrespectfully about ministers, broke confidentiality and didn’t disclose a conflict of interest.

Having interviewed advisers to past and present prime ministers in Australia, Britain, Canada and New Zealand, my new research shows how crucial it is to recruit and train staff – before an election.