Farming leaders have warned that the UK's new trade deal with New Zealand could "damage the viability" of East Anglian farms.
Boris Johnson announced a "great trade deal" with New Zealand prime minister Jacinda Ardern, which the government says will cut red tape for businesses and end tariffs on exports.
But the National Farmers' Union (NFU) warned of "huge downsides" to the agreement.
Gary Ford, East Anglia regional director for the NFU, said the deal, coupled with the earlier agreement signed with Australia, will open the UK to "significant extra volumes of imported food - whether or not produced to our own high standards - while securing almost nothing in return for our farmers".
“The Prime Minister has heralded this as a ‘great trade deal for the UK’ but farmers in Norfolk and Suffolk are unlikely to be celebrating," he said.
“These farm businesses are already facing significantly higher costs of production than farmers in New Zealand and Australia. Despite this, British farmers are being asked to go toe-to-toe with some of the most competitive and export orientated farmers in the world.
“We’ve seen next to nothing from government about how it will work with farming to achieve the gains necessary to survive this new trading environment, which makes it hard for the NFU to show support for these deals."
The deal will grant New Zealand more access to the UK market for lamb exports.
It will see all quotas on lamb lifted after 15 years, but before that there will be a quota of 35,000 tonnes for the first four years, then 50,000 additional tonnes thereafter.
However the quota will only be accessible once the existing quota that the country has through the WTO (World Trade Organisation) of 114,000 tonnes is filled to 90pc, and officials insisted that New Zealand currently uses only half of that, and there are also safeguards in place to protect farming.
International trade secretary Anne-Marie Trevelyan said British farmers should not be worried by the deal, adding: "This deal is a win-win for two like-minded democracies who believe in free and fair trade."
Shadow trade secretary Emily Thornberry said the deal "fails on every count", adding: "It is a deal whose only major winners are the mega-corporations who run New Zealand's meat and dairy farms, all at the expense of British farmers who are already struggling to compete."
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