Williams chief technical officer Pat Symonds admits the introduction of new noses for the 2015 Formula 1 World Championship created a 'headache' for the team as it looks to maintain its momentum from 2014.

Williams enjoyed an upsurge in performance last season after successfully interpreting the new regulations with its Mercedes-powered FW36, the team enjoying its best F1 season in more than a decade by scoring nine podiums en route to third in the constructors' standings.

After revealing a first glimpse at its new FW37 ahead of the first F1 pre-season test in Jerez on February 1st, compete with a shorter nosecone designed to allay claims that the latest generation of F1 is 'too ugly', Symonds admits changing the design was a challenge.

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"The change in regulations offered us a slight headache," he said. "The new front bulkhead and nose geometry had much more of an impact than we had initially anticipated and the effect on the aero was profound. The team have worked hard on pulling back the deficit these regulations have made for us."

Despite focusing its attentions during the second-half of the season on successfully beating Ferrari to third in the constructors' standings, Symonds insists the depth of the team and the long-term goals of the FW37 means it hasn't compromised itself heading into 2015.

"The first conceptual stage of the FW37 came before the FW36 had turned a wheel. The main element to this is understanding the rule changes and how they will affect the design of the car, from here we can start see if our ideas will fit within the regulations.

"The desire to beat Ferrari to third place in the Constructors' in 2014 meant we pushed our development through to late autumn, but the size of the team is now at a point where it was able to sustain this development whilst still working on the FW37."

Williams Martini Racing will retain the same driver line-up of Valtteri Bottas and Felipe Massa for the 2015 F1 season.