Christian Horner has downplayed the blown diffuser rule changes that will come into play at Silverstone, although the Red Bull team boss insists that it impossible to predict exactly what impact the action from the FIA will have on the race weekend.

The banning of engine map changes between qualifying and race day in Valencia was the first stage of the change, with the blown diffuser ban coming into place for the British Grand Prix.

The changes made in Valencia had little impact on the result of the European race as Sebastian Vettel took victory for the sixth time in eight race but Horner insisted it was impossible to predict what impact the upcoming changes would have on the field - even if he was confident Red Bull themselves could deal with the changes.

"It's the same regulation clarification for everybody," he told SpeedTV.com. "But the effect it will have on the others, that's impossible for us to predict.

"I don't think we've gone as extreme as others either with the type of air that they're blowing, or the positioning. One team obviously have built their entire car around it. One would have thought it would have a bigger impact for them than some of the others.

"I think what you'll see is that the net loss is probably going to be fairly consistent across the front running teams."

FIA race director Charlie Whiting explained part of the reasoning behind the technical changes in a question session with the media in Valencia [See separate story HERE].