Speculation is mounting that more than 1,000 jobs at Vauxhall could be axed as part of Canadian parts maker Magna’s restructuring of Opel.
A source close to the talks told BBC News job cuts could be shared between the plants at Luton and Ellesmere Port.
Last week at the Frankfurt Motor Show, Magna’s co-chief executive, Siegfried Wolf, told reporters as many as 10,500 jobs would have to go, with 4,000 of the cuts in Germany.
Tony Woodley, joint leader of the Unite union, said he had “growing concerns” over Magna’s plans for Vauxhall.
However, a spokesman from the Department for Business, Innovation & Skills, said: “Every aspect of these negotiations is under very active discussion and the government is working to secure the best possible outcome for Vauxhall in the UK.”