Interested parties have until the end of today to submit evidence of malpractice or any other breaches of the supermarket code of conduct to the Office of Fair Trading.

Although in March the OFT said that supermarkets were working to the code, it gave interested parties an additional two months to supply further evidence.

However, few parties have submitted evidence to the OFT, claiming that there is nothing further to submit.

A spokesperson for the National Farmers Union said: “We have had no further evidence or any great movement between what was submitted to the OFT previously.”

The Association of Convenience Stores, meanwhile, said that it would be submitting evidence on entry barriers in the c-store sector, fuel pricing, below-cost selling, voucher-based discounts and research which suggests that 75% of consumers are concerned about the multiples expansion into the c-store sector.