“You can see the straight line performance since Hungary (in August), and particularly in the last two grands prix, has gone exponential. And I think that obviously concerns us.”
Asked whether Red Bull were prepared to protest, Horner replied: “Make no bones about it, if we see it on the car here it will be protested.”
Andrew Shovlin, Mercedes’ head of trackside engineering, rejected the suspicion.
“We’ve had a look at it [the wing] and there are no score marks,” he told Sky Sports television.
“From our point of view we’re absolutely happy with what we’ve got on the car. We’ve invited the FIA to look at it as much as they want, they don’t have any issue with what we’ve got,” he added.
“We’ll work out what’s fastest, we’ll stick it on the car and we’ll not take advice from another team.”