Rob Smedley is confident Williams will have something more to offer when the 2015 F1 season resumes with round five and the Spanish Grand Prix.

After four races, Williams has firmly established itself as the 'third' team of F1 behind Mercedes and Ferrari, but comfortably ahead of Red Bull, with Smedley saying Williams is now focused on closing the gap down to the duo in front.

Indeed, With the first European race of the season set to see teams bring a raft of updates and upgrades, Smedley believes Williams can head to Spain with 'a lot of confidence'.

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"We're heading into the European season after a reasonably successful campaign that has put us a solid third position in the championship. Our aim now is to keep moving forward and close the gap to the teams in front. Barcelona is a good measure of everyone's upgrade packages and shows how well teams have developed their cars.

"The circuit is an excellent test of a Formula One car with Turn 3 offering a long, high speed test and sector three always being demanding on the car as it exposes its performance levels.

"We are heading into the weekend with a lot of confidence but there will be a lot of work to do leading up to qualifying as we learn about the new updated package.