There is also uncertainty about the future of the Ribena and Lucozade factory in nearby Coleford while the company behind them - GlaxoSmithKline - reviews the brands.
Glaxo plans to restructure its European drug business and is weighing its options for drinks brands Lucozade and Ribena, as it reported a decline in fourth-quarter net profit.
As part of the programme, GSK is carrying out a review of its "iconic" consumer drinks brands Lucozade and Ribena, looking at "the best ways to ensure their continued growth".