The Checkout is the self-proclaimed champion of Australian consumers, but now the ABC has been accused of breaching consumer laws as a direct result of the program.

In a writ lodged with the Federal Court, A2 Milk claims the ABC engaged in "deceptive and misleading conduct" and breached Australian Consumer Law by promoting a segment that labelled the company's scientific claims as "bogus".

Legal action: The Checkout's report on A2 milk.

A2 Milk has also written to the ABC, accusing The Checkout of breaching the national broadcaster's code of conduct by failing to provide balance, as well as reporting factual errors and inaccuracies.

In a segment broadcast on April 30, presenter Kirsten Drysdale reported on "the latest bogus developments in milk science".