Ross, would you like to start on the overtaking situation as you and Pat were on the overtaking working group I think.
Ross Brawn: No, I wasn't. Pat was. Our drivers are reporting that the cars are easier to follow. They have still got an imbalance when they follow other cars. But the cars are easier to follow. At the moment we have got the situation that some cars have KERS and some are without KERS. We have had several occasions where we have managed to get on the back of a car with KERS and we can't overtake it as it uses KERS to pull away, so we have got a little bit of an odd situation at the moment but the general impression from our guys is that the cars are better and because they have got this adjustable front wing it also helps to get the car set up when you are coming up behind someone.

Pat, has it pretty much worked the way you thought it was going to?
Pat Symonds: I have to say I am not completely sure. We are on race five now. We have had a couple of wet races, Australia is always a difficult track anyway. I have been quite impressed with the way the Brawns have overtaken us a couple of times, so maybe it has worked or maybe they are just quicker than us. But as Ross says the KERS is clouding things as well and I think it is certainly easier to follow now and that is what we set out to do. But it is not the magic panacea.

Just going back a couple of weeks, your reaction to the diffuser. What sort of effort was required for that?
PS: It was a huge effort. All the guys at the factory, from aerodynamics through design and manufacturing, really pulled the stops out to get that done. You don't just sort of design these things and they work first time. It takes a while to understand how they work and get them to a state where it is worth investing the money and putting them on the cars and they really did a super job to get that diffuser to China.

Same question to you, Aldo. As I understand it has been a massive redesign of the whole of the back end of the car and the diffuser has not been the problem. It is all the rest of it.
Aldo Costa: Yes, it is not the composite part that is the problem. The problem was a complete redesign of the hydraulic system, electric system and modifications to the rear suspension, so it was as Pat said a very, very big, huge effort to be ready in time for here with such a modified car. It is a learning curve since we had to work on this concept that we thought was illegal. We are learning now but still it is our first attempt and I am sure we have got quite a lot to learn still.

When did you start to react to the diffuser? Did you start before the ruling or did you react to it when the ruling was made?
AC: No, from the technical point of view we had to start the thing earlier because we could not wait for the decision to be made, so we started as soon as we felt that other teams had another rule interpretation.

And tell us about the other modifications here? I understand Kimi has a new chassis as well?
AC: Yes, we are running with KERS. Obviously at the moment the heavier driver, in order to run KERS, has got a disadvantage, so we tried to help Kimi be under the weight limit developing a new chassis. Later on in the season we will introduce it for Felipe as well.

And other modifications?
AC: The car we have got here is a mix between a double deck diffuser concept, our first attempt, and the development that we had already planned for Barcelona, so we have got other modifications on the bodywork and on wings.

Patrick, can I ask you for a summary of the season so far. It seems that it goes very well on Fridays, as it has today, but perhaps you are a little disappointed when it comes to the race performances?
Patrick Head: Yes, as Pat mentioned we have had some fairly sort of unusual races. In Australia we messed up a pit stop for Nico (Rosberg) and then when he was on the option tyre I think his race engineer encouraged him to push very hard as I think they thought he might be able to get Rubens (Barrichello) and the option tyre was very delicate and it fell off a cliff really for us. It was between us and various things. We have not made the best of the grands prix. Then with Malaysia and Shanghai with the wet and the wet dry, which is an opportunity for everybody, and for various reasons we did not make the best of that. In Bahrain, although Nico made a good start, he lost a lot of places going into turn one. He started ninth and finished ninth, nobody broke down. Massa broke down but I think Kimi got him going into the first corner, so it was not a very special race. We are certainly disappointed with the results but there are a few teams in that position and there is no point in kicking the dog or anything like that. You just go back and work that bit harder and try and not make the same mistakes.

What sort of modifications have you got to the cars here?
PH: We had a slightly modified diffuser for Nico in Bahrain which is on both cars now. Not big, just a small modification, and some other bits and pieces for the car all pushing up small amounts in improving the performance.