Getty Images Enlarge Christian Horner says Red Bull can't afford to relax after winning a fourth consecutive championship double. Both Sebastian Vettel's drivers' championship and the constructors' championship were secured at the Indian Grand Prix last month, with three races still to run at the time. However, despite comfortably retaining both titles, Horner says the strengths of the chasing teams means Red Bull has to be fully focused on 2014 already. "The opposition that we go up against don't give you any opportunity to relax or back off," Horner said. "You think of Ferrari, you think of McLaren or Mercedes-Benz; they're all great teams with a lot talented people in....
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