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Formula E: Electric racing car season finishes in London
26 June 2015 Last updated at 12:09 BST
The final round of the first world championship for electric racing cars takes place in London on Saturday and Sunday.
The final two races of the inaugural Formula E series will take place around Battersea Park, on the banks of the Thames.
The series is aimed at boosting the image of electric cars and promoting their improving technology.
Theo Leggett reports.
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