BRIXWORTH, England (Reuters) - Five-times Formula One world champion Lewis Hamilton vowed to raise the bar further next year as he told Mercedes factory staff on Tuesday never to stop believing in what they can achieve.
Fresh from Brazil, where he won Sunday's race and Mercedes completed a record-equalling fifth consecutive constructors' and drivers' title double, the Briton thanked the massed men and women driving the team's success and set his sights on more.
