2013 will be Pastor's third season with the team and follows a successful 2012 that saw him win the Spanish Grand Prix.

Valtteri has been the Williams F1 Team's test driver since 2010. In his role as reserve driver Valtteri has taken part in a number of this season's Friday practice sessions.

Sir Frank Williams, Founder and Team Principal, said; ''In Pastor and Valtteri we have two of the most exciting talents in motor racing and I am especially excited about what 2013 can bring for Williams. Pastor has always demonstrated remarkable pace and this year has seen him mature as a racing driver. Valtteri is quite simply one of the most talented young racing drivers I have come across and we expect great things from him in the future. I would also like to take this opportunity to thank our departing driver Bruno Senna for his hard work over the past year and wish him the best of luck.''

To be fair, Senna has not excelled in his time at Williams but he has proved, when he's been on form, a useful driver. It would be a shame to see him drop to a back-of-the-grid team but there are few mid-grid seats left available and the problem he now faces is that the music is about to stop. His name isn't enough to guarantee him a seat and, some may consider surprisingly, it hasn't been enough to allow him to garner a sufficiently big sponsor's purse to, in effect, buy his way in - unlike a number of other drivers.