About 125 jobs are to go when iconic British brand HP sauce moves production from Birmingham to Holland.
Heinz said the HP Foods plant at Aston is likely to shut by March next year.
The food giant, which bought the HP business from Danone last year, said the Aston plant normally operated three days a week and that spare capacity was available at its European manufacturing site in Holland.
* See Wednesday's Birmingham Post for more on this story *
As a result of the planned closure, the bottling operation for Lea & Perrins Worcestershire sauce will be returned to its site in Worcester.
The Aston plant has housed a manufacturing facility since 1875.
The moves were attacked by the Transport and General Workers' Union, which said it had been previously told there would be no shift in production.
* Tell us what you think - click here to get in touch *
T&G food industry leader John Jordan said: "The workers at HP Sauce in Birmingham are very bitter at this decision by Heinz.
"We are demanding a meeting with Heinz directors to get a full explanation for why the company has broken its word to a loyal workforce."
In Wednesday's Post:
* reaction the news from workers, union leaders and politicians
* detailed analysis of the reasons behind Heinz's decision
* insight into how the closure will impact on Birmingham's economy
* a look back at the history of the HP brand