National Party Leader John Key has underlined his commitment to run a clean campaign in light of secret recordings released to the media following National's weekend annual conference.

"Comments reported on TV3 tonight by National MP Lockwood Smith do not in any way amount to evidence of a secret agenda.

"It's the latest in a long line of dirty tricks and personal attacks by our opponents, and we fully expect more of these in the coming months. 

"National is being absolutely up front about the policies it intends to implement should it become the government after the election. 

"We fully intend to deliver on the promises and undertakings we are clearly presenting in the run-up to the election.

"I refuse to be distracted by our opponents' use of dirty tricks, like secret recordings and Labour's attempts to sneak activists into our conference.

"National remains focused on the real issues; the issues that matter to Kiwis."