Postpublished at 08:23 GMT 1 March 2018
Immediate improvement by Stoffel Vandoorne as he does a 1:59.167.
Valtteri Bottas has finally decided to venture out in the Mercedes so that means we've had all 10 drivers on the track this morning.
Progress.
Summary
Lewis Hamilton finishes fastest
Perre Gasly does the most laps with 147
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Postpublished at 08:23 GMT 1 March 2018
Stoff gets us off and awaypublished at 08:20 GMT 1 March 2018
And the Stoff goes and pops down the first time of the day - 2:00.707s set on the full wets.
Postpublished at 08:18 GMT 1 March 2018
Stoffel Vandoorne is the only person on the track at the moment with the rest of the drivers back at base following their install laps.
The line-uppublished at 08:16 GMT 1 March 2018
I suppose you are fairly keen to know who we will see in action today?
The driver line-up is below, although given the lack of action yesterday, it is subject to change.
Image source, Circuit de Barcelona-CatalunyaLast chance to votepublished at 08:13 GMT 1 March 2018
Best-looking car
Image source, FIAAll this week we've been asking you to vote for which car you think looks the best this year.
The vote closes at 12:00 GMT today so if you haven't made your choice, do so now. You will also be able to see which one is currently leading the way.
Postpublished at 08:10 GMT 1 March 2018
Out goes Stoffel Vandoorne in the McLaren leaving Valtteri Bottas as the only driver yet to head out for a reccie.
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Blue is the colourpublished at 08:08 GMT 1 March 2018
As you can see from the below video, it's still very damp at the Circuit de Barcelona-Catalunya.
Full wets are the order of the day as the drivers embark on their installation laps.
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Go! Go! Go!published at 08:04 GMT 1 March 2018
PING!
The green light goes and and we're good to go.
Lots of eager beavers out there this morning as Sebastian Vettel, Pierre Gasly, Sergey Sirotkin, Kevin Magnussen and Marcus Ericsson blast straight out onto the circuit.
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What happened on Wednesdaypublished at 08:00 GMT 1 March 2018
Fernando Alonso DOMINATED the day, that's what happened on Wednesday.
Granted, he was the only driver to set a time due to the conditions but details shmetails, it's just great to see McLaren top of the order again.
Image source, Circuit de Barcelona-CatalunyaPostpublished at 07:58 GMT 1 March 2018
It's a bit damp on the track this morning but comparatively warmer to yesterday - 7C air temperature and 9C track temperature.
Almost time to get cracking.
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Busy, busy, busypublished at 07:54 GMT 1 March 2018
But a bit of fog ain't going to stop us today!
It appears to be clearing quite quickly and with teams having to make up for lost time expect it to be VERY busy on the track today - so busy, in fact, that lunch has been binned to squeeze an extra hour of testing in.
Sandwiches at the desk it is today then.
Postpublished at 07:51 GMT 1 March 2018
We haven't had fog yet, have we? Then it's that today...
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End of X postThe snow in Spain falls mainly on...published at 07:50 GMT 1 March 2018
Image source, .Image caption, Snow at the circuit on Wednesday
... the circuit Circuit de Barcelona-Catalunya?
That was certainly the case on Wednesday as the white stuff effectively rendered the third day of testing a write off.
It means that so far this week we've had some sunshine, some rain and a lot of snow, is there anything else the weather can throw at us on day four?