Nico Rosberg said there were still questions to be asked about Mercedes' race pace despite topping the times in Friday practice for the British Grand Prix.

After failing to set a time in the wet opening session, where only eleven drivers set timed laps, Rosberg emerged with the quickest time in FP2; going two-tenths of a second quicker than Mark Webber at the head of the field.

Despite that however, Rosberg was quick to urge caution as he admitted that there were still question marks about how quick the team will prove to be on race day.

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"It was a pity for the fans that we didn't do much running this morning so it was good for them and for us that it was dry this afternoon," he said. "On one lap the car is still quick, so qualifying should be okay. But the question mark is our race speed.

"We practised the race speed today and it felt decent so far. But it could be a completely different picture on Sunday as the weather should be a lot warmer, so we don't know where we are right now compared to the others. I'm still quite confident that we can have a good weekend in front of our fans, our colleagues and their families.

Team boss Ross Brawn admitted that the poor conditions had created an extra challenge through the remainder of the weekend, and said it would be vital that the team now made the right calls on Saturday to aid its race challenge.

"After the wet morning, we had a good session this afternoon and managed to get some useful work done," he said. "The conditions today were cooler than we expect for the rest of the weekend, and the track was very green, so we must be careful with the conclusions we draw from our running.

"The unrepresentative conditions today mean that we will be relying on projections in order to choose the right car set-up for Sunday, so if we get that slightly wrong, we may find ourselves hurting in the race. Today was not too bad in terms of performance and the car had a reasonable balance, which helped us collect some good information on the different tyre compounds with medium and high fuel loads."