Unite will be seeking copper-bottomed assurances from the new owners of the Lucozade and Ribena brands about job security in the Forest of Dean.
Unite, the largest union in the country, said it would be asking for these guarantees, following the announcement by GlaxoSmithKline (GSK) Consumer Healthcare that it would putting its Coleford plant in Gloucestershire up for sale as part of a review of its business operations.
The site, which employs about 400, had an £18 million investment boost earlier this year.
Unite regional officer Trevor Hall said: "The shop stewards have met with management who have confirmed that the Lucozade and Ribena brands are up for sale.
"While the sale is not unexpected, it is a time of uncertainty for the workers and their families - and also for the local economy generally.
"When the new owners are announced we will be seeking copper-bottomed assurances about maintaining jobs at the plant, as well as terms and conditions.
"This is a going concern and sales of Lucozade and Ribena have risen this year. Our members have contributed to this success, so they deserve a secure future.
"We don't expect to know the identity of the new owner until towards the end of the year."
For further information please contact Unite senior communications officer Shaun Noble on 07768 693940
- Unite is Britain and Ireland’s largest trade union with 1.5 million members working across all sectors of the economy. The general secretary is Len McCluskey.