Workers' leaders have called on Ford not to accept the highest offer and walk away if it decides to sell Jaguar and Land Rover.
Unite joint general secretary Tony Woodley called for "full involvement" by the union in the decision-making process as part of a five-point list of demands published yesterday.
He also called on the Government to make sure it played its part in securing the future of the British brands with around 19,000 directly employed jobs -15,000 of which are in the Midlands - and at least twice that in the supply chain.
He said: "There are no ifs, buts, ands or maybes here. We want full involvement. We want clear decisions securing the jobs of all our members now and in the future along with their pay and pensions plus the futures of all Ford plants in the UK. To Ministers, the message is clear. If manufacturing matters, and it does, they have got a responsibility not to walk away and adopt a 'market rules ok' attitude."
The five-point plan calls on Ford to work with the union to agree the future of Jaguar Land Rover production and development sites; make continued production at these the basis for any sale; a minimum 10-year service contract with the Ford "Blue Oval" and other current suppliers.