The Fenland Foods plant, which produces Italian ready meals for M&S, is slated to close in August after Northern Foods pulled out of the deal.
New terms demanded by M&S were said to have made the deal insufficiently profitable.
More than 700 jobs could be lost if the plant shuts.
But behind-the-scenes talks have now taken place between the company and the GMB that have led to an agreement for a meeting to take place between the company and the union “to explore all the options for the future of this factory”.

