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Valtteri Bottas has brought twelve days of pre-season testing to a close ahead of the 2015 Formula 1 World Chammpionship season with the quickest time of the final day around the Circuit de Catalunya.

The Williams Martini Racing driver elevated himself to the top of the timesheets ahead of the lunchtime break with a time of 1min 23.063secs on the super-soft tyres, before the team opted to finish its programme with 90mins remaining on the clock.

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Nonetheless, it was a benchmark that would remain steadfast all the way to the final chequered flag as teams spent the afternoon fine tuning their packages and focusing on fewer performance related runs over the final four hours.

Marking the end of pre-season testing, which has taken in four days at Jerez and eight days at the Circuit de Catalunya, Bottas's top time of the day remains three tenths slower than Nico Rosberg's fastest time around the Montmelo circuit, set on Friday with a Mercedes fitted with soft tyres.

Indeed, Rosberg maintained a low profile over final day as Mercedes focused on set-up and mileage with the W06 having given a glimpse of the car's anticipated superior single lap pace on Friday and Saturday. The German ended the day seventh fastest, but with 148 laps to his name.

An unchanged top three from the morning session, Sebastian Vettel concluded his and Ferrari's efforts in second position, with Felipe Nasr third fastest having amassed an impressive 159 laps over the course of the day.

Max Verstappen brought out one of two red flags in the afternoon after a technical stop in the Toro Rosso. The Dutchman returned to the track with just 40mins remaining and used the opportunity to progress to fourth fastest in his final outing before his much anticipated race debut.

A tough final day for Daniel Ricciardo would see the Red Bull driver fail to manage more than 10 laps in the morning after developing an ERS problem. Nonetheless, a more productive afternoon would allow the Australian to finish a fairly fraught winter with 71 laps.

Getting his first day in the new VJM08, Force India's Sergio Perez maintained the car's reliable start to life by completing 129 laps and securing the sixth best time, ahead of Rosberg.

Having missed the entire morning because of more technical issues, Jenson Button managed to get out in the afternoon, but even then was limited to just 30 laps. McLaren heads into the opening round with just 379 completed laps.

Bringing up the rear at the end of the day was Pastor Maldonado, the Venezuelan suffering a crash at turn four at the start of the afternoon session. Unable to get out again, the Lotus driver would remain static on 36 laps for the day.