one of the first to switch development to their 2009 car (when new regulations came in) also hindered their season and Williams finished a disappointing 8th in the Constructors' Championship. Rosberg stated that unless the team was more competitive in the near future, he would look to drive elsewhere. Williams retained Rosberg and Nakajima for the 2009 season. Frank Williams had admitted that he had regretted parting with BMW but stated that Toyota had a tremendous ability to become a top engine supplier. Speculation had been surrounding Toyota's future on the Formula 1 grid. This was due to the fact that for a big-budget team, Toyota had only managed second place as their best result. In December 2008, Williams confirmed their commitment to F1 following the Honda withdrawal announcement. Ahead of the 2009 Brazilian Grand Prix, Williams announced that it would be ending its three-year partnership with Toyota and finding a new engine supplier for 2010. Return to Cosworth engines (2010–2011) 2010–2011 seasons After the termination of their Toyota contract, Williams announced that from the season they were to enter into a "long-term partnership" with Cosworth, and would be using an updated version of the CA V8 engine which powered their cars in 2006. Williams also announced a complete driver change for the 2010 season. Rubens Barrichello joined from 2009 Constructors' Champion Brawn GP, whilst GP2 champion Nico Hülkenberg graduated from the test driver seat. Replacing Hülkenberg in the test seat was Finland's Valtteri Bottas, who finished third in the 2009 Formula Three Euroseries as well as winning the non-championship Masters of Formula 3 event at Zandvoort. Their new 2010 car, the Williams FW32, was unveiled for the first time at a shakedown test at Silverstone. Its first official test was on 1 February at Circuit Ricardo Tormo in Valencia. Hülkenberg took the team's first pole position in over five years, in variable conditions at the . Hülkenberg was dropped from the team ahead of the season, and replaced by Venezuelan newcomer and reigning GP2 Series champion Pastor Maldonado. The combination of Barrichello and Maldonado meant that 2011 would be the first time since 1981 that Williams would start a season without a European driver in their line-up. At the second pre-season test in Jerez, Barrichello posted the fastest time of the week on the last day. That was to no avail as Williams endured one of their worst seasons