Infiniti Red Bull Racing set the defence of its Formula One Drivers' and Constructors' Championship titles in motion today in Milton Keynes UK.

The manufacturer has presented the RB9 race car. Sebastian Vettel and Mark Webber will compete this season with the updated vehicle. During the presentation both drivers were joined on stage by team principal Christian Horner, chief technical officer Adrian Newey andcorporate vice president global marketing communications representing Infiniti, Simon Sproule.

Despite the largely unchanged nature of the technical regulations for 2013, AdrianNewey explained that the off-season was far from relaxed.

The continuity in Infiniti Red Bull Racing's driver line-up for 2013 is much more straightforward. Sebastian is beginning his fifth year with the team, while this will be Mark's seventh straight season with Infiniti Red Bull Racing, the longest-established teamdriver combination on the 2013 grid.

The team departs for southern Spain this evening, with testing of the RB9 due to commence at the Jerez de la Frontera circuit on Tuesday. Mark Webber will give the car its track debut, driving on Tues 5 and Wed 6 February, with Sebastian taking over for the final two days, on 7th and 8th February.

RB9 Race Car, 1 of 11
RB9 Race Car, 2 of 11
RB9 Race Car, 3 of 11
RB9 Race Car, 4 of 11
RB9 Race Car, 5 of 11
RB9 Race Car, 6 of 11
RB9 Race Car, 7 of 11
RB9 Race Car, 8 of 11
RB9 Race Car, 9 of 11
RB9 Race Car, 10 of 11
RB9 Race Car, 11 of 11

Source: Infiniti