By Yvette McCullough of RNZ

The Deputy Prime Minister's case against two top civil servants, two former ministers, and a ministry has wrapped up at the Auckland High Court, with the judge reserving his decision.

Winston Peters took legal action because he believed State Services Commissioner Peter Hughes, and former Ministry of Social Development head Brendan Boyle should not have briefed former National ministers Anne Tolley and Paula Bennett about his superannuation overpayment.

He was overpaid nearly $18,000 over seven years because he did not fill out a section of his application form that asked whether he had a partner.

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Details of the overpayment were leaked to the media ahead of the 2017 election.

Crown lawyer Victoria Casey QC gave her closing arguments this morning and argued that Winston Peters' claim his privacy was breached "falls away entirely" when held up against the law.

While Peters' lawyer, Brian Henry, said there was a clear breach, there was no ministerial responsibility for the issue, and the briefings weren't politically neutral.

Casey told Justice Venning the only question he needs to consider is whether her clients' decision to brief their ministers under the "no surprises" convention breached a "reasonable expectation of privacy" and whether it was "highly offensive".

"The questions is not does the court agree with these decisions to brief, or even whether the court has any reservations about the decisions to brief," she said.

National Party politicians Paula Bennett, right, and Anne Tolley (centre, in blue) arrive at the Auckland High Court. Photo / Peter Meecham
National Party politicians Paula Bennett, right, and Anne Tolley (centre, in blue) arrive at the Auckland High Court. Photo / Peter Meecham

Peters makes 11 complaints, including that the briefings were given under the guise of the "no surprises" policy, was a "sham" and that the information was nothing more than "salacious gossip".

He also claims the briefing was out of order because it related to operational matters and was therefore not the ministers' concern.

But Casey told the court none of these complaints are relevant to the legal question at hand - privacy.

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"None of them establish whether there was a reasonable expectation in private facts. None of them establish that the communication from the chief executives to the ministers constitute highly offensive publication.

"Winston Peters could not have had a reasonable expectation public agencies with such information would not tell their ministers who have accountability to the House," she said.

Casey also spoke of the high stakes for her clients, because these allegations go to the heart of their integrity.

She warned that if Peters' complaints are upheld it would be "catastrophic" and career-ending for them.

"I ask the court to pay due attention to the chilling effect on the public sector and the reputational impact of even a passing comment by the High Court of the judgments exercised by these two senior public servants.

"I submit that it is appropriate that the court should exercise real caution before engaging in a review of matters that are beyond the scope of the pleaded claim," she said.

Casey also repeatedly relayed her argument that many of Peters' claims, as well as not being proven, were never put to her clients under cross examination.

Deputy Prime Minister Winston Peters and his partner Jan Trotman arrive at the Auckland High Court. Photo / Jason Oxenham
Deputy Prime Minister Winston Peters and his partner Jan Trotman arrive at the Auckland High Court. Photo / Jason Oxenham

However, in his closing, Henry, said issues such as "salacious gossip" were an inference of facts and therefore no cross examination was required.

He also said that Peters was not accusing her clients of "bad faith" but rather for them to "prove good faith".

Henry said because of the way things played out in the trial, it has become clear, in his view, that on the balance of probabilities, the person who leaked Peters' details to media can be traced back to MSD.

And he again pointed the finger at MSD staff for the overpayment happening in the first place.

"It's very simple, had the MSD staff said 'please complete the question', we just wouldn't be here", he said.

However, under cross examination yesterday, Boyle said MSD's position was that it was assumed the answer was complete because Peters had filled in the next part of the question, ticking that he was "living apart/separated".

Justice Venning made the point to Henry that had Peters read the explanation note by the question correctly, he would not have needed MSD staff assistance.

Henry responded that this was a fair comment but "equally the worker is there to process it properly and if it's obvious that someone has missed a step they've just got to say, look, either read the question properly or complete that sequence".

"We say the making an assumption [argument from MSD] is just simply a retro idea to try and avoid the fact that there was involvement in the mistake by the MSD," he said.

Henry said the determination that it was an honest mistake and Peters should pay the money back was made at an individual level by an MSD staffer, and for that reason, it is a matter that is completely separate from the minister and should have remained so.

Henry argued that the only purpose of the briefing was "salacious gossip" and it "has no other value to the minister".

"That's the whole point. A minister is not involved in this level of detail and the minister has no place whatever to discuss it or comment on it, should it go into the public," he said.

Henry said everyone involved in this case is "politically astute" enough to understand the social and mainstream media storm that would occur if this became public and the damage this could cause to his client's reputation.

He said Peters is still fielding inquiries from members of the public who question his honesty.

Justice Venning has reserved his judgment and indicated that a decision is unlikely before the Christmas break.

- RNZ