Dr Norman noted the Prime Minister had recently reprimanded Agriculture Minister David Carter for jeopardising the process of assessing Natural Dairy NZ's OIO application with comments that the purchase was unlikely to go through.
"On the other hand ... the lawyer working for this firm gets to inform the view of the minister who's going to make the decision about changing the legislative framework."
In the House this week, Mr English indicated he was not concerned that Mr Petersen might be advising the Government on the review while acting for an overseas investor.
"We did follow the common-sense course of asking those people who use the act a lot what could be done to improve it," he replied to a question from Dr Norman.
The Cabinet would ultimately make any decisions about changes to overseas investment rules, he said.
In the meantime, Natural Dairy NZ's application to buy the Crafar farms would be subject to the "very thorough" process consistent with the existing legislation.