Hello and welcome to our LIVE comments and timing of the final free practice session of the Korean Grand Prix at Yeongam. The action starts at 3am UK time.

Thanks for joining us for that final practice session, with qualifying only a couple of hours away. Be sure to return for that, with Vettel surely the favourite for pole but Hamilton and Button in fine shape too.

That was all in vain - Webber can't get out as he stalls and that will cost him for qualifying in terms of feel for the track, and data. Vettel, meanwhile, is blasting his way through to what will be the fastest lap with his last effort - 1:37.642. Have that.

Hamilton with a blasting middle sector after a slower first sector; he improves to only two tenths off Vettel. Let's see how he finishes. Not great for Button just there, 0.7s off.

Vettel has gone under 1:38 now, the first to do so. Webber will get a lap, no more.

Webber is STILL stuck in the garage as his spaceship of a car gets sorted after that engine issue. He doesn't look happy.

Massa had a good first sector but he loses a lot in the second as Vettel improves his time by two tenths. Standard.

Button is out, with Hamilton also showing good pace, although Raikkonen gets in his way. Button two tenths shy of Vettel at sector 2. And he finishes three tenths down. Hmm.

Alonso improves on his previous time on the softs but not enough to make a dent on the top three. Should see a few quick flyers now we're on the supers.

Lots of traffic as Alonso is held up by his pal Massa. News on Webber - some kind of engine flooding. Odd.

Okay so most of the guys are out now on the supersofts for some simulation laps. No news on Webber.

Red Bull look very concerned as they may not be able to get Webber out on the supersofts, which would be semi disastrous ahead of qualifying.

There's a problem with Webber as he gets set for his race simulation run on the supersofts. Maybe his KERS?

Looks like Senna will be out there first on the supersofts. Vettel is having them changed now.

Schumi, meanwhile, has moved into sixth with a 1:39.150 ahead of the switch to supersofts as they look to mimic race conditions - so expect to see Button enjoy himself.

Vettel seems happy with that and eases off in the final sector of his next lap. He'll be confident in qualifying, although anything can happen with Button and Hamilton on form.

Vettel is brilliant in qualifying, brilliant in practice, all thanks to his superior car - and that's what gets him the pole positions. Racing wise, you have to favour Button and Alonso in a scrap (and Hamilton, provided he doesn't try to maim anyone).

Vettel, on the softs, does show that speed as he moves to the top of the timesheets with a cool 1:38.215.

A real contrast to yesterday's hellish FP2 for Hamilton, who is showing great speed and appears to be enjoying himself. Sometimes it's good to let off steam.

Now Button sneaks into second behind Lewis and ahead of Webber as we have an Anglophone top three and a UK-McLaren top two. Vettel is set to return to the track after a breather. Let's see if his superior machine can show its speed.

Hamilton is on fire now - he's just gone top ahead of Webber, a shade under 1:38.5. Nice.