Whaleoil blogger Cameron Slater has lost one of the country's longest running defamation cases after failing to put up any credible defence.

The judgment has been greeted as "magnificent" by businessman Matthew Blomfield, who sued Slater for defamation after a series of blog posts in 2012 accused him of illegal and immoral behaviour.

Blomfield said: "Finally there is something solid out in the public domain to show that all of Cameron Slater's nonsense was just that, nonsense.

"As this judgment clearly shows, he was given every possible chance to show that he had a defence to my defamation claim, but in the end he could produce nothing."

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The judgment made public today saw Justice Paul Davison find in Blomfield's favour, ruling out a defence from Slater after long delays and failures to meet legal requirements to defend a claim of defamation.

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Slater has taken the judgment to the Court of Appeal. There is yet to be a ruling on what the loss will cost Slater.

The case against Slater and his company, Social Media Consultants Ltd, focused on nine blog posts on the Whaleoil website over a month in mid-2012.

It saw claims by Blomfield the blog posts were a deliberate attack orchestrated by a former business partner Warren Powell and associates after a falling out in their Hells Pizza business.

Businessman Matt Blomfield, outside the High Court at Auckland. Photo / Doug Sherring
Businessman Matt Blomfield, outside the High Court at Auckland. Photo / Doug Sherring

Evidence on the court file showed Powell and others met with Slater before the blog posts to plan "Operation Bumslide" - a plan to target Blomfield.

The blogger then obtained - allegedly from Blomfield's former business associates - a hard drive which contained 10 years of Blomfield's communications and information.

The new judgment came after a defamation hearing due to start on October 8 was adjourned when Slater and lawyers arrived at court without a proper defence.

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In total, Slater had entered or attempted to enter five statements of defence over the course of the case which all failed to meet the legal requirements for attempted defences of truth and of honest opinion.

Those defences required the blogger to either present the source of details he claimed as fact to show they were true, or to show statements had been made as opinion based on facts which were known at the time of publication.

Davison said Slater had been "afforded considerable leniency" to meet deadlines and get a proper defence before the court.

There had been "indulgence" to allow Slater to change his defence with one High Court judge even providing the blogger guidance as to how to prepare for the defamation hearing.

Davison said Slater's attempts to change his defence and to introduce new pleadings was rightly seen as "a last-minute attempt to prevent the (Blomfield's) claim from being heard and determined by the court".

He said it was possible to see delay as Slater's objective when seeking court hearings on issues such as a security for costs.

Blogger Cameron Slater.. Photo / NZME
Blogger Cameron Slater.. Photo / NZME

Davison said the statement of defence Slater had arrived with when the trial was due to start failed to identify the facts which would have been used to prove his blog posts were true.

Instead, large piles of evidence had been pointed to which, in a number of cases, relied on "a third party's allegations about the plaintiff".

And instead of providing a defence of honest opinion, Slater's court filings instead repeated his inadequate defence of truth.

Davison said it wasn't necessary to rule on the merits of the case because of the legal, technical flaws in Slater's attempted defence.

"However, in my view the documents relied on by the defendants do not provide cogent support for the propositions and conclusions they seek to draw from them in relation to the defences of truth and honest opinion, or the bad reputation of the plaintiff."

The judgment recorded Slater had made claims in a blog post which included saying the "Blomfield files" would expose "drugs, fraud, extortion, bullying, corruption, collusion, compromises, perjury, deception, (and) hydraulic-ing".

Davison said Slater's defence "fell well short" of providing facts which supported the accusations printed.

An example highlighted by Davison was a blogpost by Slater claiming Blomfield had "ripped off" the charity KidsCan.

He said Slater's own lawyer had conceded "the emails (relied on) ... did not establish or support the existence of a conspiracy to 'rip off' or defraud the KidsCan charity involving the plaintiff".

Davison said the ongoing delays were unfair to Blomfield, who had a right to have the case heard.

The judgment was initially suppressed but is now public after a successful challenge by Blomfield's lawyer Felix Geiringer.

Blomfield said he believed the case would likely run another year or more through the appeal process.

"Our justice system is fundamentally broken in this way."

He said it allowed a litigant intent on delaying justice to drag out the court proceedings.

Asked if he had a message for Slater, Blomfield said: "You cannot do this to a person and suffer no consequence. You cannot make up lies about someone and try to destroy them and then simply walk away.

"You were paid to destroy me. You did irreparable damage to my businesses, to my family, to me. But no matter how long you delay things, your day will come."

Journalist Nicky Hager with his book Dirty Politics, based on emails hacked from Cameron Slater's computer. Photo / Mark Mitchell
Journalist Nicky Hager with his book Dirty Politics, based on emails hacked from Cameron Slater's computer. Photo / Mark Mitchell

Justice Raynor Asher, in a 2014 judgment, said " the material provided by the sources appears to have been unlawfully obtained" and it had "the hallmarks of a private feud". He said there was no public interest in the blog posts, which appeared driven by a "personal vendetta".

Asher also found the hard drive and other documents provided to Slater "appear to have been obtained illegitimately".

Slater featured in the 2014 book Dirty Politics, based on information hacked from his computer which revealed he had acted as an attack dog for elements of the National Party, and had accepted cash to write blog posts pushing or attacking particular issues.

His blogging activity has diminished recently after he suffered a stroke.

Slater is facing further defamation action from health academics. He recently came away empty-handed - and escaped unscathed - from mutual defamation actions against Colin Craig.

Slater and Powell did not respond to requests for comment.