Mercedes:, external Session resumed: our boys are parked for the time being. Bit of radio chit chat going on. You know, about the weather... the usual.

Image source, Getty Images

Williams driver Valtteri Bottas: "A new season and the first time we see where everyone is competitively.

"The weekend will be interesting but also important as we have to be able to have a strong start and make sure we gain the most from the weekend, especially as other teams improve.

"You never know how other teams will progress throughout the season, so points here are key. I like Melbourne, the first race is really when the gloves come off so qualifying will be an exciting session."

The track is green and out pops Valtteri Bottas in the Williams.

Kevin Magnussen clambers on to the back of a motorbike as his McLaren is lifted away by the recovery vehicle.

The session should be back under way shortly.

Image source, Getty Images

If you haven't already noticed, Lewis Hamilton's Mercedes is sporting #44.

As world champion, he can slap number one on his car but he has stuck with the same number he had during his karting days.

That means there is no number one car on the grid for the first time since 1994. Alain Prost retired as 1993 champion and Damon Hill took number 0 for that year, having had it the previous season.

With 20 minutes gone it is Sebastian Vettel with the benchmark time. Lewis Hamilton is currently second fastest, with Kimi Raikkonen third and Romain Grosjean fourth.

McLaren:, external Kev has hit the wall at Turn Six. He's reported that he's fine, but that's a red flag. Session stopped to retrieve the car.

Niall Ash Raff: It's going to be a three horse race between Hamilton, Rosberg and Vettel, I think!

Francis Waso: McLaren an absolute disgrace! Forget new engine supplier. This always happens. Unprepared & off the pace at start of year!

Kevin Magnussen runs wide at Turn 6, seemingly locking up the rear of his McLaren and runs off and into the tyre wall. The red flag is waved as Magnussen steps out of his stricken car.

Sergio Perez has a little wobble, running wide, but recovers and is back on his way. Perez is not the first to have a brief spell off the circuit in this session. The wind has picked up a little and seems to be having an impact.

Daniel Ricciardo watches on from the Red Bull garage as his old team-mate Sebastian Vettel goes fastest in FP2 with 1:29.801s.

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And Daniel Ricciardo will also not be heading out on to the circuit after his engine change.

Felipe Massa is not heading out in FP2, there is a water leak on the power unit of his Williams, with the team saying it "has necessitated the removal of the power unit".

Image source, Mercedes

Mercedes: Lewis Hamilton is ready for more! Green light well and truly shining... let's go!

Marcus Ericsson joins his Sauber team-mate Felipe Nasr in heading out, swiftly reporting over team radio that there is "a really strange feeling on the brakes".

Tom Clarkson
BBC F1 pit-lane reporter

"I am stood in front of the Manor garage and there is a lot of action going on but I am afraid we will not see any track action this afternoon. They are having one electronic glitch after the other at the moment."

The pit lane is open and a Sauber heads out! Felipe Nasr takes the C34 out on to the circuit for the first time today.

Not great news for Daniel Ricciardo and the Australians in the stands as Red Bull tweets: "Not the start we were hoping for with an engine change for Daniel - the team are doing their best to get him out this session."

Image source, Toro Rosso

Toro Rosso:, external Okay, another 90 minutes of track time coming up: it's #FP2! Let's get ready