Alonso slots into P2, 0.650s behind Button.
Button sounding a bit tetchy on the radio. Says both ends of his car are struggling due to the wind, but McLaren can't hear him, and he snaps: "Sort the radio out!"
Rosberg has just gone purple in the first sector.
Looks like Rosberg had to back out of his latest lap as he did not improve on 16th. Hamilton, meanwhile, has no problems with his lap, going purple in sectors one and three and jumping clear of Magnussen by nine tenths.
Just 0.03s separating the McLaren drivers at the moment.
Personally, I've never understood why arrogance is seen as a negative trait in a sportsman.
A negative trait in a person, sure. But in a sportsman surely it's part of what's needed to dominate.
Rosberg finally hooks a lap together but is still a full half second off Hamilton.
Ricciardo's first lap has put him seventh, 1.5s off Hamilton - he then tells Red Bull the Red Bulls are giving him a hard time.
Are Ricciardo's problems with the rear to do with the wind this afternoon? Several drivers complaining about that so far.
Hamilton shaves another three tenths off his time, extending his lead over Rosberg to nearly nine tenths.
@mfbull: There are some chaps on our UK desk here who might not agree with that.
Rosberg goes fastest with a blistering lap of his own, a full half second faster than Hamilton now. He went purple in S1 and S2.
Vettel, the man dominating so much of our conversations here, the only man yet to record a lap.
Raikkonen also really struggling, he's just ahead of the Lotus' in 15th. Alonso, meanwhile, is fourth.
@Kristiyan: Teams don't tend to reveal their upgrades, for obvious reasons. I've noticed a few tweaks to their nose and something at the back of the car, too. Clear that McLaren has really made progress over a few races, not just today.
Hamilton returns to the pit lane having aborted another lap of his own.
Looks like the championship leader lost the rear under braking in Turn 12, but he managed to catch the slide pretty well.
@Phil,Maidenhead: I do feel that most 'Vettel haters' are in reality 'Vettel trolls' for this very reason.
@Race_Soul: Early stages of this session yet - remember we don't know fuel loads or what run plans these drivers are on. Hulkenberg finished ninth in the morning session, even if Perez was 15th.
@mfbull: Force India are one of the other teams who you would say are on the slippery slope. Not unable to race just yet but in a position where finances are tight.
We're approaching the end of the first half hour and we still haven't seen any driver bolt on a set of soft tyres.
@mfbull: Almost certainly.