Formula 1 returns - the new cars of 2013 in pictures
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Testing for the new Formula 1 season has begun in Jerez, Spain, with new Mercedes driver Lewis Hamilton at the centre of attention. The Briton switched allegiances from McLaren at the end of the last campaign, after a 17-year association with the team. Hamilton got behind the wheel of the new Mercedes GP F1 W04 vehicle as it was unveiled on Monday.