Former Black Cap Chris Cairns arrives at Southwark Crown Court in London, England. His perjury trial moved into its fifth day on Friday (Saturday NZ Time).

Retired professional Kyle Mills was unaware of International Cricket Council (ICC) rules requiring players to report any match fixing approaches, he told the Chris Cairns perjury trial jury.

New Zealand cricket captain Brendon McCullum told him in late 2008 or early 2009 that Cairns had talked to him about fixing, Mills told Southwark Crown Court by video link.

"I was pretty gobsmacked at the time," Mills told the jury.

FRANCOIS NEL/GETTY IMAGES Former Black Cap Andre Adams told the court Chris Cairns said at a dinner 'how will they ever prove it?' in regards to match-fixing.

Cairns, 45, is charged with allegedly lying under oath in a libel trial, by saying he'd "never" cheated at cricket. He has denied all charges.

His lawyer Orlando Pownall, QC, asked Mills why he had not reported what McCullum had told him.

Was he not aware of his obligation to do so under the ICC rules - which stipulate a ban of six months to two years for failure to report a third party approach?

"Now that you've just told me, yeah," Mills told the court.

Mills, whose brother Heath is New Zealand Cricket Players Association chief executive, said players were much better educated around match fixing now, than they were in 2008.

"At that time, we were taken aback. Now in international cricket, we get really good education about it from the (ICC) anti-corruption unit."

In his evidence, McCullum said Cairns twice approached him in 2008 to spot-fix, in a Kolkata hotel in India, and a Worcester cafe in England. McCullum had mentioned to him only the incident in England, Mills told the court

Spot-fixing involves under-performing - batting slowly - for set periods of a match, to influence betting odds and the outcome of games, so those with insider knowledge stand to win money.

Mills was on tour with the Black Caps in 2011, when McCullum decided to tell the anti-corruption unit about the approaches, after a briefing to the team by anti-corruption unit official John Rhodes, he said.

"We said 'mate, you've got to go and see John Rhodes about that approach'."

Mills and Andre Adams, both retired pace bowlers, appeared on Friday, the fifth day of evidence in the case against their former Black Caps teammate. They were the day's only witnesses.

Adams told the jury Cairns talked openly of Indian Cricket League (ICL) match fixing at a 2008 dinner in Delhi, saying "how will they get anyone?"

Adams, played for the Kolkata Tigers in the ICL, while Cairns was Chandigarh Lions captain in the same rebel competition..

"In New Zealand, he was one of our heroes. In India, he was like a God, really," he said by video link.

He recalled a "bunch of Black Caps" gathering at the dinner, and the conversation turning to match-fixing rumours in the ICL

The dinner was after Cairns had left the ICL, and officials were investigating allegations of fixing, the court was told.

"I can remember Chris saying even if there is match-fixing, what can they do about it? It's a non-sanctioned event. How will they get anyone? How will they prove it?"

Under cross-examination by Pownall, Adams said it would be "correct" to say he couldn't remember the conversation "100 per cent".

He did, however, recall "very clearly" words to the effect of "how will they ever prove it?"

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Adams did not report a direct approach from Lou Vincent, the trial's opening witness and now banned from cricket for life after admitting match-fixing.

Adams said Vincent, a former flatmate and long-term friend, had talked to him in England about an opportunity he was sure was fixing.

He told the court the name Chris Cairns never came up in his talk with Vincent.

"It was more insinuated than anything else. I guess I knew what we were talking about, spread betting or match-fixing."

It came at a time when ICL players were "outcasts" for having played in a competition not sanctioned by the ICC.

Adams, who felt Vincent was trying to help him, turned the offer down. He did not report Vincent, he told the court.

"I didn't want to feel I'd let Lou down, at the time he was pretty fragile (mentally). I didn't want to be responsible for pushing him over the edge."

Adams feared his friend could "commit suicide or do something stupid" if exposed as a fixer.

McCullum told the court on Thursday (Friday NZT) he was to be opening bat for the Kolkata Knight Riders in the Indian Premier League when Cairns talked to him of how a spot-fix would work for overs one to six.

Cairns said he could make between US$70,000 (NZ$105,000) and US$200,000 (NZ$300,000) a game for fixing, McCullum told the court.

Cairns made a second approach in England in June 2008, McCullum said.

Witness statements from international cricket umpire Steve Davis and New Zealand-born England-based Michael McCabe, were read to the jury.

Davis witnessed a motorway service stop meeting between Vincent and Cairns in June 2008, in England. He stopped and said hello, and was told they were having a "catch up".

McCabe, a doctor, had gone to a Worcester cafe on the morning of June 11, 2008, when Cairns came in with a man he thought was McCullum.

When media stories later emerged alleging Cairns was involved in match-fixing, with the name of McCullum linked, McCabe contacted the ICC.

"I did this because I thought it might be important," his statement said.