We moved in caravan formation and at the speed of camels, taking two days to drive the 250 miles from London to the west coast of Wales, pottering along in a pair of Morris Travellers.

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It has two doors, four seats, a W12 engine, all-wheel drive and a top speed of 202 mph.

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The two rivals are developing a high-volume, six-speed automatic transmission suitable for front-wheel-drive cars.

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