Jaguar workers have been asked to vote on compulsory Saturday working in a move which threatens to split the factory workforce.
The plant ballot follows initial proposals by the Tata-owned organisation to introduce compulsory overtime at Castle Bromwich to bring the factory into line with the other manufacturing centres at Solihull and Halewood.
But the idea has been criticised by some workers, who claim it is part of a new culture of management under Operations Director Grant McPherson.
Both Land Rover plants at Lode Lane and on Merseyside currently operate compulsory overtime arrangements to help meet demand for 4x4s.
But the Jaguar plant at Castle Bromwich has so far been exempt from similar agreements.
A worker, who asked not to be named, said: “We have had a plant-wide meeting from the shop stewards and they have told us the company wants to bring in compulsory Saturdays.
“Over the next couple of weeks it has got to go to a vote; the workforce are not happy at all. There are a lot of questions about it – we do not know whether or not we will get a day off in the week.
“There is very little overtime at Castle Bromwich anyway. It seems to many of us at Jaguar that this is a case of ‘you will do this.’
“People like to have their weekends free but there is an atmosphere where management seem to be saying the company has to come first, ahead of family and personal lives.”
The move to bring in compulsory overtime at Castle Bromwich comes as Jaguar Land Rover continues its impressive recovery from the recession.
Last month the firm announced record profits of £559 million for the last quarter of 2011 as demand for its premium cars soared in Asia.
The figure marked a huge growth on the £300 million of profits generated in the last three months of 2010. JLR revenues soared by 41 per cent to £3.75 billion in the quarter.
A company spokesman said: “JLR has regular dialogue with the unions representing our workforce. These discussions cover a wide range of possible opportunities to improve efficiency aligned with JLR’s growth plans.”