Christian Horner believes Red Bull Racing has the strongest driver line-up in F1 in Sebastian Vettel and Mark Webber, both of whom he claims are 'at the top of their game and pushing one another very hard' - and, most worryingly of all for the team's rivals, he suggests they are only going to get better still.

The German-Australian pairing have notched up a trio of one-two finishes for the energy drinks-backed outfit in 2009 to-date - equal to world championship leaders and key title protagonists Brawn GP - and remain unbeaten over the course of the last two grands prix in Britain and Germany.

The only minor headache that could cause for the powers-that-be at RBR is that whilst Brawn seemingly very much has its efforts placed behind Jenson Button in the chase for the crown, Vettel and Webber are but 1.5 points apart in the drivers' standings, and don't have the luxury of being able to take points away from each other as they have been doing in recent races. Horner is adamant, though, that team orders will not come into play until absolutely necessary - and a championship one-two is clearly what the Englishman has in his sights.

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"Both men are being treated with total fairness within the team and are supplied with identical equipment," he underlined. "We will continue to support both drivers equally. There's only a point-and-a-half between them, so obviously they are both in contention for the drivers' championship. There's a long way to go to catch up with Jenson Button.

"If and when we reach a point where there is a significant gap, or it becomes mathematically impossible for one of them to challenge for the championship, then they are both team players and one of them will play a supporting role should it be required. Our intention is to see both of them catch the lead Brawn as quickly as possible.

"When I saw Mark in early January, he'd forgotten to mention he'd also broken his shoulder! He couldn't put any weight on his right leg, and I remember thinking 'this is going to be interesting!' He was resolute in his determination to drive the new car at its launch, though. After he drove RB5 for the first time, there was a look of relief in his eyes, as I think he was unsure if he would still have the same feeling in his right foot and how he would cope with the bumps on-track. From then on, there was never any doubt he was going to be fit for Melbourne.

"In typical Aussie fashion, he carried the injury without letting on about how much pain and discomfort he was feeling. He's had great support, and his physios and trainers have done a great job. I think it's only now we are seeing Mark at the level of fitness he was at prior to his injury, and his recent results show he is absolutely in the form of his life.

"Sebastian is undoubtedly a star in the making. He shows remarkable maturity, given his lack of experience. He is a prodigious talent who will continue to get better. The best is yet to come from him. Our drivers are both at the top of their game at different stages in their careers, and they are pushing one another very hard. I think we've got the best driver line-up in F1 at the moment."

Given that the man from Heppenheim is already being touted as 'the next Michael Schumacher' in some circles, that is a daunting prospect indeed - and in describing Webber as a 'very valued member of the team', it is clear that Horner has every intention of hanging onto both men beyond the end of the present campaign.

Indeed, the harmony between the duo, he contends, is representative of the prevailing atmosphere in Milton Keynes in general, with a buoyancy and determination boosted by the knowledge that the Adrian Newey-designed, Renault-powered RB5 is the in-form package as the championship enters full speed ahead into its second half, and that the ball - and momentum - are very much in Red Bull's court.

"The rewards on-track are different, but the pressures are the same," Horner opined, alluding to a disappointing 2008 that yielded just seventh spot in the final constructors' rankings - behind so-called 'junior' concern Scuderia Toro Rosso - with but a sole podium finish along the way. "We are working as hard as possible to get as much performance as possible, as quickly as we can. Everyone at the factory has a spring in their step at the moment, even if the pace of development required to meet this year's major regulation change has been relentless. There are a lot of unsung heroes at the factory, putting in superhuman efforts and hours to get the components on the car.

"There were already signs of a change last year, when RB4 delivered reasonable performance in the first half of the season, while in the second half Red Bull Technology had good results with Toro Rosso, in what was essentially an identical car. The design group has really gelled and is working cohesively, and the integration across the whole group - R&D and the production side - is working very well. This is down to stability and continuity in what is still a relatively young team.

"It's a testimony to how strong the test team was that, when we conducted the difficult exercise over the winter when as [at] all the other teams we had to make redundancies, we went through a scrupulously fair system to identify the best candidates for the roles we had available. The group of guys in the garage are brilliant. The camaraderie between the two car crews and the way they work for each other is fantastic; the team spirit is very strong this year."

Domination at Silverstone and the N?rburgring aside, the highlight of the season to-date, Horner affirms, has to be the breakthrough victory achieved during a torrential downpour in the Chinese Grand Prix in Shanghai back in April - a result that, after 75 starts at the highest level, finally put Red Bull firmly on the map at the highest level as a genuine contender. As maiden successes go, it was a commanding one - but if the team credited with putting the fun back into F1 is to lift the ultimate laurels in 2009 too, more of the same will be required over the final eight races.

"It was a very proud moment representing Red Bull at the team's first win, having been here since the beginning," acknowledged the 35-year-old,a former racer himself. "Looking down and seeing the faces of all the guys looking up at the podium and standing next to the two drivers who'd driven brilliantly is a moment I will certainly always remember. It was a great feeling, especially at the end of such a long race of almost two hours, held in atrocious conditions.

"You can always do better, though. Putting aside our performance and two dominant one-two finishes in the last two races, the team's determination to continue to improve and not to take anything for granted is very important. There are no obvious weaknesses in our armoury, but as a group we must continue to push ourselves in all areas all the time."