Kimi Raikkonen insists there is still more to come from the Ferrari package despite emerging comfortably fastest in practice for the British Grand Prix at Silverstone.

Although edged by Lewis Hamilton in the morning, French GP winner Raikkonen restored order in the afternoon by becoming the only driver to dip below the 1min 21secs mark and impressively so, the Finn a good four tenths quicker than Hamilton overall.

Nonetheless, despite Raikkonen's form, he claims the decision to undertake longer runs in practice mean there is more speed to be eked out of the F2007 into the business end of the weekend.

"It was a good day," he said. "We worked in a different way to usual, covering a high mileage. I would say we have a good base from which we can improve the car for qualifying and the race. We have to do well and we will give it our all. Track conditions were a bit difficult because of the wind, while it seems that, compared to the test two weeks ago, the track surface is a bit slipperier.

"The tyres seem very similar in terms of performance, give that we I have done almost the same lap time on the hards and the softs. As usual on Friday, there are so many unknowns in terms of the order among the teams. We must wait and see how the weekend develops."