Day four: Red Bull's Sebastian Vettel is one of the first out on the Circuit de Catalunya track in misty conditions

BMW Sauber's Robert Kubica, who some critics rate as the most talented driver on the F1 circuit, battles with a lack of light

It has not been a great week for McLaren, who have lagged behind on pace, but Lewis Hamilton still finds time for a joke

Nico Rosberg, of Williams-Toyota, puts in an impressive performance over 120 laps and finishes second overall in the unofficial timings with 1:19.774 as his fastest lap

Local Fernando Alonso continues to be the centre of attention with fans who have found their way into the F1 paddock

But Rubens Barrichello completes a superb week for his newly-created Brawn GP team, finishing top of the pile with a fastest lap of 1:18.926 on the final day of testing in Spain

Day three: fresh from receiving an MBE from the Queen, British Formula One world champion gets behind the wheel of his McLaren-Mercedes

But the day does not go well for Hamilton - he has a crash, his second of the winter, and is slowest of all on the track

The new Brawn team continues to impress - Jenson Button sets the fastest time of all on Wednesday even though this is their first test of the winter

Looking like an extra from Star Wars, a Toro Rosso team mechanic waits in the pit lane during the penultimate day of testing at the Circuit de Catalunya

Much is expected in 2009 of Red Bull's Sebastian Vettel, the 21-year-old who brilliantly won the Italian GP at Monza last season for Toro Rosso

After team-mate Kimi Raikkonen dominated day two, Ferrari's Felipe Massa - the man who finished just a point behind Lewis Hamilton in the 2008 driver's championship - prepares for his own test laps

The Ferrari is second fastest behind Button - just ahead of Robert Kubica's BMW, followed by Timo Glock's Toyota and Fernando Alonso's Renault

Day two: Red Bull-Renault's Mark Webber is one of the first on the track on the second day of the four-day test sessions as the sun comes out near Barcelona

Follwing the impressive day one exploits of Jenson Button, Brawn GP teammate Rubens Barrichello is pushed back into his team's garage during his period of test laps

Two-time world champion Fernando Alonso, the most successful current driver in F1, puts his new Renault through its paces

Toro Rosso's Sebastien Buemi completed only six laps in the afternoon, meaning the team managed just 20 laps overall for the whole session

Day one: 20-year-old rookie Buemi and teammate Sebastien Bourdais (right) represent one of the most inexperienced pairings in F1 as all 10 teams gather in Spain to test their new cars

They peel the covers back to unveil their new STR4 car, a joint venture between Red Bull Technology and Toro Rosso fitted with a Ferrari V8 engine

Bourdais, who endured a tough 2008 season, is the first to drive the SGR4 car over the course of Monday and Tuesday

Brawn GP's Jenson Button is all smiles at the testing circuit in Spain only 20 days before the 2009 season starts in Melbourne on 29 March

And he goes well, recording an unofficial time of 1:22.414 in the Brawn car - promising given his fastest lap for Honda in last year's Spanish Grand Prix was 1:22.353

Button informs veteran Brazilian team-mate Rubens Barrichello of his initial thoughts on the car, which has a Mercedes V8 engine

Although it is only testing, the Brawn's pace is impressive - just 0.2secs slower than Kimi Raikkonen's Ferrari, which is second fastest overall behind Nick Heidfeld's BMW on the first day

And Heidfeld believes the German Formula One team can be a serious contender for the 2009 world title following the raft of new F1 regulations

McLaren do little to counter rumours they are struggling a little with their car when Lewis Hamilton's team-mate Heikki Kovalainen is slowest of all - 1.8secs adrift of the Brawn

Renault's Nelson Piquet, driving in a car with perhaps the loudest livery of all, recorded the fifth best time of the day - 1:21.662