The Chief Ombudsman will investigate the Prime Minister over his refusal to release details regarding his, and his office's contact with right-wing bloggers David Farrar and Cameron Slater.

Back in early 2014 Newstalk ZB requested records of all such contacts that had occurred over a two year period.

John Key's office declined to release details, saying to do so would require substantial research and collation and also that some communications may have been made in Mr Key's capacity as an MP and leader of the National Party.

Now, almost two and a half years after a formal complaint was laid with the Ombudsman about the matter, Chief Ombudsman Peter Boshier has announced he will investigate the compliant.

He's written to the Prime Minister notifying him of the complaint, and also asking for a report on his office's decision.