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Jaguar Land Rover has warned that a "bad" Brexit deal would hit its income and threaten its £80bn investment plans.
The UK's greatest carmaker, owned by India's Tata Motors, mentioned its "heart and soul is in the UK."
But it acknowledged that with out frictionless commerce its UK investment plans can be in "jeopardy".
The warning comes forward of a cupboard assembly to finalise a Brexit White Paper on Friday.
Jaguar Land Rover chief govt Ralf Speth mentioned: "A foul Brexit deal would value Jaguar Land Rover greater than £1.2bn revenue every year.
"As a outcome, we must drastically regulate our spending profile; we have now spent round £50bn within the UK prior to now 5 yearswith plans for a additional £80bn extra within the subsequent 5.
"This would be in jeopardy should we be faced with the wrong outcome."
Mr Speth mentioned the agency "urgently need[s] greater certainty to continue to invest heavily in the UK".
The automotive maker has about 40,000 UK-based staff. The warning follows comparable statements from BMW and Airbus.
After these warnings in June, Health Secretary Jeremy Hunt mentioned the threats have been "completely inappropriate".
"We are in an absolutely critical moment in the Brexit discussions and what that means is that we need to get behind Theresa May to deliver the best possible Brexit," he mentioned.
"The more that we undermine Theresa May the more likely we are to end up with a fudge, which would be an absolute disaster for everybody."