An hour of free practice begins in Suzuka!

We'll be back in two hours - 6am UK time - to bring you qualifying? Will the Red Bulls turn up and dislodge Button from the top? Join us for the action.

There are several drivers doing some practice starts as the session draws to a close.

Sure enough, it is: Webber clambers up to 5th, but it's the only notable move in the final moments. Button leads another McLaren one-two - and yet it looks like the Red Bulls have more in reserve.

Session over - drivers can finish the lap they're on, but it looks like Button will be top once again.

Vettel a second down on Button, but looked very comfortable nevertheless.

Massa creeps up to fourth in the meantime, as well. Vettel looking a touch heavy, as if he's running a hefty fuel load.

Some key drivers coming through as the session comes to an end. The times will come in this order: Hamilton, Alonso, Vettel.

Hamilton coasts through a second lap, but looks to have put his foot down for another timed lap now.

Alonso comes through a second behind Button, but it's good enough to take third place.

Hamilton up to second - half a second adrift of Button, however - looks like Button's set a very decent mark.

Buemi up to seventh after his flying lap - one place ahead of team-mate Alguersuari.

Rosberg crosses the line on his attempted flyer - but he cannot improve his best time.

Here come the rest of the field. Interestingly, Button is out of the car and that looks like session over for the Briton.

The Toro Rossos are out on soft tyres, they're on their own.

Button's hot lap a little earlier than the rest of the field - they're all in the pits for the moment, watching on.

Button clocks a 1:31.255 - that's 1.4 seconds better than Schumacher's best time. He looks a bit bemused in the Mercedes pitlane.

It's going to be very quick - Button ripping up Schumacher's mark through the first two sectors.

Button is out on a flyer on soft tyres. How will his pace compare in a qualifying-style simulation?

Schumacher sets the new fastest lap on the option tyre - a 1:32.725. Webber, not on the same compound, tucks into second pace, just seven-hundredths of a second behind.

Vettel has done 13 laps already in this session, and now he's back in the pits. Most drivers in the garage for the moment.