Nick Heidfeld posted the quickest time on the final of Formula One testing at Jerez while defending World Champion Lewis Hamilton saw his day of running in Spain halted by an accident during the afternoon.

On a day affected by sporadic showers, Heidfeld posted a quickest time of 1min 20.052secs at the wheel of BMW Sauber's F1.09, which saw the German end up three-tenths of a second clear of Kimi Raikkonen.

Gusty wind conditions prevented Heidfeld completing any meaningful aerodynamic work as had been planned, with team technical guru Willy Rampf admitting that the changing conditions over five days hadn't made things easy.

"The ever changing weather made it quite difficult to do continuous work during the Jerez test," he said. "Nevertheless we achieved the main targets of our development programme. Basically we concentrated on set-up work and evaluation of new components. Running the BMW Sauber F1.09 for the first time in full wet conditions was a valuable experience as well.

"In addition on one of the days we had the chance to test the 2010 specification tyres. Now we will have a busy weekend working out the programme for the last pre-season test in Barcelona next week. Then we will also have a complete race simulation and pit-stop practice on the schedule."

Raikkonen slotted into second place on his second day of running at the wheel of the F60 while Hamilton was third, despite his accident bringing McLaren's programme to an early end.

The Briton had been working on set-up of the MP4-24 before he was caught out by a gust of wind and went off track, slightly damaging the rear of the car and dislodging the rear wing despite the slow nature of the incident. With insufficient time to repair the damage before the session ended, the team elected instead to end its programme to begin planning for next weeks test in Barcelona.

Mark Webber and Red Bull worked through a programme focused on Bridgestone's 2010 tyres, with the Australian ending the day fourth quickest, while Kazuki Nakajima was fifth for Williams as he took worked on next years tyres.

"My two days in Jerez were quite badly affected by poor weather," Nakajima reflected. "We had strong winds on both days and then some rain this morning as well. When out on track, we worked on our aero package and testing mechanical parts.

"We had a good run yesterday, doing lots of comparison work, and we now have some good results to take back to the factory. We spent today testing the 2010 tyres which was interesting and it's given us an idea what running tyres without blankets will be like."

Jarno Trulli rounded out the times in sixth place for Toyota, although his time on track was brought to an early close when he suffered some damage to his front wing after running over the kerbs midway through the afternoon.

"That was a short day for us," he said. "We lost the morning to the weather but in the afternoon we had a chance to try out the 2010 Bridgestone slick tyres. The conditions remained difficult because the wind was still strong. On one run I picked up some damage to the front wing after running over kerbs. Still, we made it through a number of runs and collected data for the future. As for this season, this test shows that things are going well for us so we can be confident."

Testing resumes at Catalunya next week.

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