Red Bulls gatecrash Button's party

Jenson Button's British Grand Prix party this weekend is poised to be gatecrashed by a Red Bull Racing revolution.

In revamped cars, and sporting new front wings dubbed 'duck breast', Sebastian Vettel and Mark Webber crushed their rivals in practice.

Ordinarily, you should never read too much into Friday's practice times, but in this instance, Vettel and Webber were a class apart, leaving Brawn GP boss Ross Brawn to say: "They're too quick, and I think we're going to have trouble this weekend."

Red Bull Racing boss Christian Horner underlined his team's intention as he said: "We're determined to try and stop Jenson Button winning yet another race.

"That is where our focus now immediately turns to. We owe that to the fans, to the public and to Silverstone. This is an important weekend."

Vettel was over 0.8 seconds quicker than third fastest Button at the end of the first session, and more than 0.6 seconds ahead of a surprise third best in the second period in Force India's Adrian Sutil.

Only team-mate Webber was within touching distance of the 21-year-old German come the conclusion of each 90-minute run.

Potentially usurping Button as race favourite, Vettel said: "It was a good day for both of us.

"The new parts we brought here seem to be working well, which is a good sign, but on a Friday it's always difficult to know how quick we really are.

"I think we've made a step forward though, and just like our team slogan 'Red Bull Gives You Wings', I think they helped us for our performance on track."