Today was largely what we expected from Friday in Belgium, with quite a change in track temperature from the morning to the afternoon, and a significant degree of track evolution in FP1. However, the track was generally in good condition, which enabled a lot of representative data to be collected. We saw long runs on both the soft and the medium tyres during the afternoon, in roughly equal proportions. The weather forecast suggests cooler conditions for the race on Sunday; one reason why the teams focussed on medium and soft tyres, although we can't of course exclude the possibility of the hard being used as well. With the big demands that Spa places on tyres, teams will be monitoring the levels of degradation closely as they refine their strategies. We've seen a reasonable amount of degradation on the soft tyre today, so a large part of the work from here on will be optimising the car balance on the soft tyre, in order to make the most of this compound during the race.