@aditya: That opens a can of worms! They are both very different drivers than they were in 2007. Now it would be even more difficult to call.
Currently we have Ericsson and Bottas on track in front of some impressively busy grandstands.
Lots of interest here from the locals, not least because Alonso is starting work in his new job today.
Ah, no sooner do I type than the Sauber and Williams return to the pits. So that's no cars on track.
Nico Rosberg has now completed a whopping 60 laps. We knew they were going to be quick, we knew they were going to be reliable, but 60 laps in a brand new car on its first three and half hours of (official) testing is very impressive.
@DanielKrause: I heard it on the first run when it was running rather rough! However, it has since done a three lap run and on that it sounded fairly similar to the others. However, it wasn't being pushed in the slightest - the interesting noises start when the throttle is pinned open or during downshifts for braking. Last year in Abu Dhabi it sounded nice to me as it left the pits.
@Siddhesh: The car will need to be repainted, but teams strip the paint back and repaint pretty much every time the chassis goes back to the factory. They'll stick with this for testing and then we'll have the familiar blue, yellow and red (and most likely Inifiniti purple) in Melbourne.
@robert: Interesting question! No, not necessarily. Especially as teams can bring updates throughout the season, teams can actually run two different specs in either car. Also, given that teams have four PUs for the whole season, they will sometimes swap back to an older power unit for mileage reasons. So, no is the short answer.
@JohnJenifer: No major change there. I've yet to go trackside to listen to them closely but certainly in sheer volume they are no louder.
@Mel: I'll need to go trackside to check, but at this stage it's not really worth it. A lot of the laps are pretty slow at the moment as teams run through system checks and make sure everything is working as it should. These first days are basically about troubleshooting, the fast stuff and performance chasing comes at the next two tests.
@Ace: Not entirely sure what cooling holes they had before. In Abu Dhabi they had some cooling in the side of the sidepod, but that was just a rudimentary job to get the Honda engine running in last year's chassis at the end of the year (unfortunately it didn't work). However, the less obvious cooling the better, is cooling usually a trade with aerodynamic efficiency.
Bottas and Rosberg are back on track after a short lunch break.
And you thought an F1 driver's life was glamorous...
@TheF1Fan: As predicted - by both the team and the media - getting the new Honda power unit running smoothly is a big job. But the big thing will be how much progress they can make this week. So far we've seen three 1 lap runs and a 3 lap run. So that's progress...
@kedia: It's a prerequisite for F1 drivers not to suffer from car sickness ;)
@SaptakDas: Don't read anything into the timesheets at this stage. The main objective for teams is to get the car on track and complete laps. In that respect Mercedes is leading the way, but there's not surprise there.
@GlennoBailey: When Pirelli run a development tyre it is often unmarked. But I need to check with Pirelli first to confirm that. I think Vettel was out on them earlier too, so it is not specific to the McLaren.
@SaptakDas: We will see teams do race simulations as testing goes on, but that doesn't mean it is a 100% true reflection of their pace. Updates will come again for Melbourne and that's when we'll start to get the true picture.
@AnderssonOuissi: As Laurence mentioned earlier, it's too early to really make such sweeping guesses from the morning's running. There are lots of things the teams are working through here and will be for the rest of Jerez. Barcelona will be a better indication of true pace and reliability for the season.
@surendranc29: The team hasn't said anything officially, but the last thing they said was that the plan was to arrive in Barcelona with the 2015 car. There are rumours to the contrary flying around online but at the moment assume they are until we hear otherwise from Force India.
I can confirm Ferrari is in Jerez. There's not been a great deal to talk about from Ferrari - only nine laps to Vettel's name at the moment.