Williams Martini Racing has publicly revealed its 2015 F1 challenger, the FW37 Mercedes, ahead of F1 pre-season testing in Jerez.

Though an early glimpse at the car showed what to expect when it was eventually unveiled, the public reveal presented a first proper look at the 'thumb' nose, a variation on last year's design.

Williams - which retains an identical line-up of Valtteri Bottas and Felipe Massa - will also carry additional backing from Rexona on the side-pods, the firm moving over from Lotus, while there is more notable decals from Martini.

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"The team learnt and developed a lot in 2014 and this has made us a better team and well prepared for the challenges that face us as we head into a new season," said Claire Williams. "We are all eager to see where we are in comparison to our rivals.

"We have worked hard over the past six months to get this car ready, but it is in no way the final product, we have a lot of work to do throughout the season as we push for constant improvements in performance. I am incredibly confident in the team around me and the line-up we have that 2015 can make it another successful and exciting year for Williams Martini Racing, and now can't wait to get back on track."