F1 testing: What we learned on day one

BBC F1 pit-lane reporter Tom Clarkson rounds up the stories on the first day of pre-season testing at Jerez.

World champions Mercedes and runners-up Red Bull unveiled their new cars in Spain.

It was a good day for Mercedes who completed a record 157 laps while the new McLaren-Honda struggled, and the watching crowds got used to seeing Sebastian Vettel in Ferrari red.

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