Valtteri Bottas has played down questions about the competitiveness of the 2015 Williams by suggesting that the team has instead missed out on better results through its preparation decisions.

The Finn enjoyed six trips to the podium in 2014 as Williams staged a remarkable recovery from the F1 doldrums, but has appeared in the top three just once this season as the FW34 struggles to keep pace with the all-conquering Mercedes. Team-mate Felipe Massa has two top threes in twelve races, and currently sits fourth - two places ahead of Bottas - in the championship but, with Ferrari showing more consistent form and a couple of unexpected top three appearances from the likes of Romain Grosjean and Daniil Kvyat, silverware has been harder to come by for Williams.

Bottas, however, dodged accusations that the Grove team had missed the opportunity to build on its 2014 form by suggesting that it had simply missed out on capitalising on the current package at races where perhaps it should have showed stronger form. The higher-downforce tracks in Monaco and Hungary remained an issue, with the Finn finishing 14th and 13th respectively, but he also highlighted ninth place on a frustrating weekend at Spa to back up his argument.

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"One important thing is that we can't have bad tracks for us," he said when asked what the team needed to focus on for 2016, "We need to be strong everywhere if we want to score good points consistently - if we want to challenge, we need to be quick everywhere.

"We should have been better prepared for Spa, maybe by making a Spa aero package like many other teams did. I think that's the main thing - we need to be more reactive to different types of tracks. We have the good tracks for us, ones that we pin our hopes on, but that's not enough if you want to win."