Re: British GP - It's also how the car has been designed and how it handles in various different states, though.
To me it looked like RBR was all downforce and Diffuser, and when that was removed they were all over the place, Ferraris were designed without it, and they had no real difference with or without it, and the McLaren falling in between - without the diffuser it was not as nice to drive as the Ferrari, but not as compromised as the RBR.
Effectively Alonso had prettty much had the whole season to that point in a car without one, so he didn't need to adapt as much, so he had the confidence and it really showed.
To me it looked like RBR was all downforce and Diffuser, and when that was removed they were all over the place, Ferraris were designed without it, and they had no real difference with or without it, and the McLaren falling in between - without the diffuser it was not as nice to drive as the Ferrari, but not as compromised as the RBR.
Effectively Alonso had prettty much had the whole season to that point in a car without one, so he didn't need to adapt as much, so he had the confidence and it really showed.