The UK food industry has asked the government to waive aspects of competition law to allow firms to co-ordinate and direct supplies with each other after a no-deal Brexit.
The Food and Drink Federation (FDF) said it repeatedly asked ministers for clarity on a no-deal scenario.
Existing rules prohibit suppliers and retailers discussing supply or pricing.
The industry says leaving in the autumn could pose more supply problems than the original Brexit date last March.
The FDF, which represents a wide range of food companies and trade associations, said: "We asked for these reassurances at the end of last year. But we're still waiting."
The boss of one leading retailer told the BBC: "At the extreme, people like me and people from government will have to decide where lorries go to keep the food supply chain going. And in that scenario we'd have to work with competitors, and the government would have to suspend competition laws."
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