It was a surprise that we didn't see more overtaking in Valencia, even though the DRS rear wing was in use on two straights. This perhaps reflects the fact that the overtakings we've seen this season are a phenomenon caused mainly by the tyres, not the DRS. The effect of the adjustable rear wing has been overhyped.

The biggest impact on overtaking has come from tyre degradation, especially when both compounds have been a bit bad. Then the differences in grip between different cars have become large as the drivers have driven with different strategies. The rear wing has only been a bonus for overtaking.

In Valencia we had two reasonably strong tyres, both of which had no problems with overwearing or overheating, and the rear wing didn't help enough with the situation. For tracks like Valencia, where you know overtaking is difficult, you should bring the kind of tyre compounds where the option lasts only for five laps and the prime for eight laps. That way we would definitely create interesting conditions.

Regarding the exhaust blowing we didn't really see any difference compared to the earlier situation, even though the rules changed a bit in Valencia, when we couldn't change the engine mapping between the qualifying and the race. I have a feeling that in Silverstone we won't be seeing changes, at least in the top positions, because of the ban of exhaust-blown aerodynamic diffusers. It's more about who gets their tyres working and how each driver's car adapts to specific tracks. I tested the new exhaust system on Friday morning in Valencia. Sure, you can see the difference in the time, but I'm sure everyone else can, too. The speed differences still won't change the order on the scoresheet substantially.

Red Bull rules the series, and behind them Ferrari is strong on tracks like Montreal and Valencia which have long straights and hard braking. McLaren may be a bit stronger compared to Ferrari on tracks like Silverstone, where there are long, fast curves.