An Audi Q3 is tested at Mahle Powertrain's solar testing facility
Emissions regulations for cars and vans will remain similar to those currently set for petrol cars
CEO Elon Musk admitted lack of boats, trains and car carriers prompt firm to rethink methods
Rolls-Royce's Goodwood facility employs more than 2000 people
CEO Torsten Müller-Ötvös says he would never give up firm's status as a British industry 'crown jewel'
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