Welcome to our LIVE coverage of the final practice session for the British Grand Prix at Silvestone. The lights have gone green and cars are straight out onto the track.

Back on the track, stewards going into the high-speed Copse corner are clearing huge chunks of rubber away. Shouldn't be too long before we're up and running again.

"The tyre exploded!" an incredulous Perez tells his pit crew over the radio - he's still going, and is now limping back down the pit lane on three wheels.

The session has been red flagged! Bits of Perez's tyre are strewn all across the racing line.

Sergio Perez has had a blowout! The McLaren driver had been going well, but his back left tyre is in absolute tatters and he is forced to pull off the circuit onto the Northamptonshire grass.

Nico Rosberg now comes out onto the circuit, and he's trying the hardest compound.

Valtteri Bottas in the Williams leaps to the top of the timesheets so far with a 1:33.603.

Alonso clocks 1:35.159 with his first lap.

Hamilton is a good three seconds off the current pace in his opening lap, but will stay out to help his crew get data on that problem.

Fernando Alonso is now out on the ttrack for the first time.... let's see how he does.

Teams playing around with all sorts of settings today: Red Bull have made some adjustments to their exhausts. Check out Will Gray's blog on how set-up affects the cars here:

Raikkonen improves to 1.34.184 with his second flying lap, still a little way off yesterday's FP2 times in the 1.32s.

Bad news for Lewis Hamilton already - he's announced that "there's big vibration already" over the radio. Hamilton is one of four drivers out on the medium tyre, the rest going out on softer tyres at the moment.

Raikkonen comes around and avoids the pits, and will set the first time... it's a a 1:34.367.

Vettel and Raikkonen are among those out on the circuit, with drivers nipping on and off the track and no times being set yet.

It's dry and warm, if cloudy, at Silverstone this morning, and several cars are straight out onto the circuit - perhaps fearing rain later on in these highly changeable conditions.