The defence has been summing up in the Chris Cairns perjury trial.
Reporter Tova O’Brien joined Paul Henry live from London.
Cairns’ lawyer Orlando Pownall QC suggested McCullum went to authorities so he wouldn’t be sanctioned himself.
It's accepted by both sides that Cairns and McCullum had met and spoken about spread-betting in 2008.
The defence also questioned why Cairns would choose to recruit a player as unlikely to cheat as McCullum.