Valtteri Bottas enjoyed another productive day behind the wheel of Williams' FW37, but the Finn admits it could have been even better had it not been for interruptions.

The Finn put in another 129 laps of the Circuit de Catalunya, eventually posting the fifth best time of the day at 1m 25.345s as he worked on a combination of set-up evaluations and a race simulation, but was frustrated by several enforced breaks in his programme.

"We completed quite a few laps today, which was positive even though our programme was disrupted a few times," he acknowledged, "The FW37 remains reliable, but we have quite a way to go before we are at the level we want to be - although we are on schedule. Both tests have been relatively issue-free, so we have begun preparations for Australia and look forward to the final test next week."

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Bottas' Sunday effort left him only twelfth on the combined timesheets for all four days of testing, but team-mate Felipe Massa underlined the latent potential of the new FW37 with sixth spot overall and chief test and support engineer Rod Nelson confirmed that other teams' problems had affected Bottas' performance.

"We had a very busy plan today, but the morning was tough due to the wind conditions which affected our chassis testing and, in the afternoon, [when] we had a race-sim planned, this was interrupted by three red flags," he noted, "Again, in the final run of the day, there was another red flag [and] all of these stoppages stilted our progression slightly and meant we couldn't quite complete our plan. Throughout the whole test though we have gathered a lot of data and are prepared for the final test next week."