"I don't think the practical side has been really thought through ... the devil is in the detail, not in the principle, " he told BBC Radio 4's World at One programme.

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"We want to open doors to new clients that say, 'I would love to have a Ferrari but I don't see one that fits my practical necessities, " says Mr. Montezemolo, who estimates at least 40% of its FF customers are first-time Ferrari buyers.

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"The Scottish Executive has done a lot on publicity but I don't think they've done too much in practical terms, " he said.

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"I don't think this is anything that's going to be done in the next few decades in a practical sense, but maybe further down the line, " Gray said.

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