Mike Hawes, SMMT chief executive, said, “UK Automotive is globally competitive, securing record levels of investment, creating tens of thousands of jobs annually and exporting to over 100 countries. We want this success to continue rather than jeopardise it by increasing costs, making our trading relationships uncertain and creating new barriers to our single biggest and most important market, Europe. Remaining will allow the UK to retain the influence on which the unique and successful UK automotive sector depends.”

The message was underscored by senior figures from a wide range of UK-based automotive companies.

Ken Gregor, chief financial officer of Jaguar Land Rover, said: “Remaining in the EU – our largest market – will increase Jaguar Land Rover's chances to grow, create jobs and attract investment in future technologies. Our European supply chain has been fundamental in helping us to meet customer expectations worldwide and achieve sustainable, profitable growth.”

Tony Walker, deputy managing director, Toyota Motor Manufacturing UK, commented: “After considered review, we believe that continued membership of the European Union is best for our business and for our competitiveness in the longer term.”

Dr Ian Robertson, Member of the Board of Management, BMW AG, added: “We firmly believe Britain would be better off if it remained an active and influential member of the EU, shaping European regulations which will continue to impact the UK whatever the decision on Thursday.”

Rory Harvey, managing director and chairman of Vauxhall, concluded: “We are part of a fully integrated European company where we benefit from the free movement of goods and people. We believe not to be part of the EU would be undesirable for our business and the sector as a whole.”