LONDON, England - Formula 1 driver Mark Webber has hit back at criticism from Red Bull's Helmut Marko accusing the team advisor of having his own agenda at the world championship-winning team.Webber wrote on his website: "Look, everyone at this level has their own agendas and it's been evident for a long time now that I've never been a part of Markos.Marko, who is close to Red Bull's billionaire owner Dietrich Mateschitz and triple world champion Sebastian Vettel, was quoted earlier in January 2013 as saying Webber could win races but struggled to handle the pressure of a championship challenge.Red Bull's house magazine, Red Bulletin, reported: "It seems to me that Webber has on average two races per year where he is unbeatable but he can't maintain his form throughout the year.Marko added that Webber's form fell "easily into a downward spiral" if something went against him and suggested that losing out to Vettel in the 2010 title race had been a huge psychological blow.VETTEL IS SUPERIORMarko, whose career as an F1 racer ended when he was blinded in one eye, was also quoted by Germany's Sport Bild as saying Vettel had beaten Webber in all four years of their partnership and that would not change.He said: "The statistic speaks for itself. There is no reason to think the balance of power will change."Webber, who enjoys a good relationship with team principal Christian Horner, has been at Red Bull for longer than Vettel and will be starting his seventh - and possibly final - season with the British-based team, with the first race in Melbourne on March 17.The 36-year-old, whose contract expires at the end of the season, said he was in good shape after having surgery in December 2012 to remove a 40cm titanium rod in his right leg.RECOVERY SURGERY Webber broke his leg after colliding with a car in a cycling accident in Tasmania in 2008.Webber said: "The surgery went very smoothly and my recovery was exceptional. I had a few weeks off from my normal training schedule but I was able to ease myself back into it by the first week of January and now I'm back into it properly."I didn't really know what to expect from having it removed, apart from my own peace of mind, but I'm very happy that some of the niggles and pain I've sometimes experienced with my training over the past three years already seem to be a thing of the past."