Although he did speak once on television, the ageing Attlee still undertook his traditional speaking tour of the country, driven by car from hustings to hustings, as usual, by his faithful wife Vi.

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The tour follows the discovery of his remains beneath a car park in Leicester by a team of archaeologists, in August.

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The world's smallest synthetic motor was created by Alex Zettl, professor of physics at University of California, Berkeley in 2003 while the first nano car (without a motor) was built by James Tour in 2005.

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Later on Thursday they will travel by car through Somerset villages on their way to Bath for a tour of the Roman Baths, the Pump Room, the Guildhall and the Abbey.

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