Brawn, Williams and Toyota have had a problem this season - having had the diffusers on their cars ruled legal at the start of the season. Ferrari, Red Bull and Renault lodged an appeal against this decision - it's no surprise that they have done badly this season. Thankfully, the decision was taken that the diffusers were not illegal - to decide otherwise would have made a mockery of the start of the season. Now the other teams have to play catchup - as it should be.
On to China.