Tulip has announced that it is to cease its packaging operation at its Thetford, Norfolk, plant with the loss of up to 350 permanent and 200 agency jobs.
According to management the packaging division will close in mid September now that the 90 day consultation period has concluded.
The fresh pork and bacon packaging lines will bet transferred to plants in the West Country. Ninety staff will stay at the Thetford site with the cooked bacon processing plant. At the same time the Tulip's UK HQ will also move to Tipton in the West Midlands.
Unions, who have agreed the redundancy package, were critical of parent company Danish Crown.
Miles Hubbard, regional industrial organiser for the Transport and General Workers' T&G) section of Unite commented in a local media interview: "We presented sustainable alternatives but it was very apparent that Danish Crown was determined to shut the plant.
"We are happy that our people are not walking away with nothing and have pushed the company as far as we have, but it does not get the company off the hook interms of its moral obligation.
"We are very disappointed it took away the long-standing enhanced redundancy package. The way Tulip and Danish Crown has behaved is indefensible."
However management at the company said they had done everything they could to save the plant but that it was no longer a competitive unit.
Peter Judge, managing director of Tulip's North East Division, said: "Company and unions had left no stone unturned during the 90-day consultation period, but that the Thetford operation had been inefficient for several years.
"This is a very sad day for everyone involved in the Thetford site and we do appreciate the impact this news will have."