@SammieSrini: The change for next year's engines is not set in stone, it's just one of a number of issues being discussed.
@mfbull: My bad. Looking at the winter and the fact Vettel did a lap earlier, I honestly can't see Ferrari finishing lower than second ever again.
@MaxFlyingDutchman: I used to play the F1 games against my younger sister until she started beating me. I don't lose very well.
@Nate Saunders: it's very unlikely anything will change until 2017. Teams then all need to agree on change, which is easier said than done.
Verstappen is absolutely throwing his car around out there. The 17-year-old really going for it.
Here's Lotus' last tweet on Grosjean....
@aniket: Manor is basically working through its checklist and tackling any issues, such as an early engine software glitch. The sort of things the team would have done in testing.
@Sicilianking89: They are certainly hoping to be, fifth in the constructors' is the aim this year.
@Boris: Doesn't sound very cost-efficient.
@mfbull: Yes, it is. Shame it wasn't in F1 mind.
Six minutes left and the track is pretty busy.
@chints: The team is probably wary of the legal ramifications of doing so. The Van der Garde situation is such a mess.
@Sicilianking89: From what I've seen the car looks a bit friendlier. It did in Spain, too. Watching trackside, Raikkonen looked much happier in both fast and slow corners.
@MaxFlyingDutchman: Thanks for joining!
Mercedes tells Rosberg he needs to save a bit more fuel on his current stint. Hamilton was better in that regard last year, remember.
Seeing a replay of Vettel nibbling at the grass on the exit of Turn 10.
@Alexferfa: We only report updates from his family or management, or the hospital. There are no updates so we respect his and the family's privacy until they feel ready to give us anything further.
@Trush: Grosjean said yesterday he thinks there's been an even bigger step forward on the chassis side than on the engine side. Happy faces all around in the Lotus garage.
We're approaching the final minute of the session.
@MarcusMak: Cue a joke about him finding it "shocking"
@IsManortakingpartinFP1?: You must always be wary of reports of people who claim to be in the know, on Bianchi and Schumacher. I think you're right about his last update but remember to read anything with a pinch of salt on both men unless it's an official statement.
@Bruce: No, there was no electric shock. But people keep making the joke.
The practice session is over and now we will have a Virtual Safety Car test, one of the new rule changes to this year.
@StevenKaufman: Haha, very good. Though Briatore said that report was erroneous.
There you have it. Shock horror, stop press, it's a Mercedes one-two in the first session. More woes for McLaren in the first session while confusion still reigns over the situation at Sauber.
That's all we have time for from FP1. We'll be back to do it all again in just over two hours.
@Capoa: Journalist first, F1 fan second.
We will be back just before 1630 local time for the second practice session of the day. Please join again, see you later. You European fans, try and get some sleep!