Christian Horner admitted that Sebastian Vettel's title victory in Abu Dhabi was an 'unbelievable outcome' for Red Bull Racing as the team secured a championship double in the F1 season finale.

The team had wrapped up the constructors' championship with its 1-2 finish in the Brazilian Grand Prix a week earlier, with both Vettel and Mark Webber going to Abu Dhabi with a chance of beating Fernando Alonso the title.

While Webber's hopes were ended by an early pit stop that left him stuck in traffic, Vettel led the race from the front - only ceding top spot briefly when he made his own visit to the pits.

With championship leader Alonso only able to manage seventh place, Vettel became the youngest F1 champion in history by four points and Horner admitted it was a brilliant outcome for his team.

"It's an unbelievable outcome," he said. "The first time Sebastian has led the Championship is at the last race of the year, but arguably that's the only time you need to lead it. He's stuck with it though this year, he's had some tough times and he's had his issues with reliability here and there, but he's never lost his focus. He's the youngest ever Formula One World Champion and a very deserving World Champion. It's down to what he's done on the circuit and the whole team is hugely proud of what he's achieved today.

"We mustn't forget Mark in all this and what an incredible job he's done this year. He's driven superbly well, he's won four grand prix victories and has taken the Championship to the final race. It could have gone to either one of them this year and it's a great privilege to have these two guys in our team. But today belongs to Sebastian Vettel and it's fantastic to have Mr Mateschitz here to witness our first Drivers' World Championship.

"It's been a very big and emotional week for the team and I'd like to thank every single member, all our suppliers, everyone at Red Bull and Dietrich Mateschitz for his unfaltering support. It's been a very, very big week."