Competition watchdog the Commerce Commission has confirmed whistleblowers who come forward with information about alleged unfair business practices by supermarket giant Countdown can do so under cover of anonymity.

The commission is currently mulling whether to launch a formal inquiry into Labour MP Shane Jones' allegations that Countdown pressured suppliers into making payments or else face having their products pulled from its shelves.

Mr Jones, the Food and Grocery Council and Prime Minister John Key have all called for suppliers who come forward with information to be able to do so anonymously.

A buy-Australian campaign in two Australian supermarket chains is a sobering lesson for the Green Party and anyone else in New Zealand who advocates the same thing here.

This afternoon the commission said it would grant them that protection.


"The Commission will not disclose the identity and/or information unless consent is given or the Commission is required to by law," it said in a statement.

"If confidentiality is a concern then it should be raised when first contact is made with the Commission."

Mr Key this morning underlined his support for a formal investigation, saying that while he had never seen anything to demonstrate that Countdown were performing or acting improperly, "for everybody, Countdown themselves and New Zealand consumers and for New Zealand workers we need to understand what's gone on".

Meanwhile as a campaign to boycott Countdown supermarkets gathers pace, Mr Key warned against adopting protectionist measures.

Tauranga man Nevan Lancaster a week ago started a Facebook page "Boycott Countdown" in response to Countdown's Australian parent company, Woolworths Ltd, dropping New Zealand suppliers from some of its own brand product lines in Australia, in favour of local suppliers.

The number of "likes" leapt from 1000 on Wednesday to 8117 by this afternoon following Mr Jones' allegations.

Mr Lancaster wants people to stop shopping at Countdown and instead give their grocery dollar to locally-owned producers and suppliers.

"Basically if our goods are not good enough to be sold to Australians, then the company is not good enough to sell to us," Mr Lancaster said.


This morning Mr Key said that with New Zealand so reliant on food exports, "if we get too protectionist in New Zealand while it might feel good in the very short term in the long term, we run the risk that there's retaliatory action around the world and we don't benefit from that at all".