Postpublished at 14:52 Greenwich Mean Time 6 March 2018
Stoffel Vandoorne heads back out. He currently has the 11th fastest time.
Second pre-season F1 test
Runs from 08:00-17:00 GMT
Stoffel Vandoorne's McLaren stops twice on track
Red Bull also brings out the red flag
Get involved #bbcf1
Gary Rose and Lorraine McKenna
Stoffel Vandoorne heads back out. He currently has the 11th fastest time.
#bbcf1 or text in on 81111 (UK only)
Lester Mak: I think people forget that The Chain is a British thing for F1. The rest of the world is probably not aware of it. If @BrianTylerMusic, external just samples The Chain, I bet everyone could love it
Alex Holland-Martin: Theme song you need for Formula One got Be have Queen don't stop me now.
Lot Grundy: As a musician, I always encourage new theme songs for tv shows, as it encourages and pays new talent. Also, I've been horrified when f1 or the snooker have changed their songs in the past. Luckily, I'm under no obligation to make sense. Thanks for listening.
Sebastian Vettel heads in without posting an improvement leaving Max Verstappen, Lewis Hamilton and Marcus Ericsson on the track.
Some news from Sauber with Colombian Tatiana Calderon confirmed as the team's test driver this season.
The 24-year-old, who races in the GP3 feeder category, has been promoted from her previous role as development driver.
The Swiss-based team said she would “complete simulator training sessions and coaching with engineers both on-site and during several grand prix weekends”.
Calderon said: “I have been able to substantially expand and develop my skills as a race driver and am convinced I will be doing so throughout this year.”
Team principal Frederic Vasseur said: “Tatiana is a very hard-working, who has impressed the team with her focus and dedication. She has made good progress as a driver, developing both her mental and physical capacities continuously over the past few years.”
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Sebastian Vettel and Lewis Hamilton are back out on the track. Vettel is on mediums, Hamilton on softs.
#bbcf1 or text in on 81111 (UK only)
Joanna Harran: Nervous every time I am tuning in for an update. Come on Lady Lucky give @McLarenF1, external a break!
Dan Knutson
F1 journalist in Barcelona
After turning 86 laps in the morning, the work continued for Valtteri Bottas who did some TV interviews in afternoon.
Lance Stroll completes a few times laps. He starts with a 1:29.932 on softs, steadily improving to 1:25.214 before heading back in and leaving Stoffel Vandoorne alone on the track.
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Verstappen 104
Vettel 103
Bottas 86
Ericsson 66
Gasly 54
Perez 52
Hulkenberg 48
Magnussen 50
Sirotkin 42
Vandoorne 30
Hamilton 26
Sainz 2
Lance Stroll appears for the fist time today in the Williams, meaning we've now had everyone scheduled to appear on the first day of testing doing just that.
Twenty five laps and counting for Lewis Hamilton so far today. Mercedes have done 111 laps so far today.
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Sam Harper: Think people are misunderstanding the new #F1, external theme tune, it's nothing to do with the Chain, it's that cheesy orchestral bit that plays when all the streamers are flying across the screen just before the race starts.
Lex: Everyone saying that the F1 theme tune will always be The Chain clearly don't remember the banger that was Lift Me Up by Moby
Ben Pilbeam: As much as I love The Chain, it makes me reminice and think of the past. It's time for @F1, external to look forward and not back #, external
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Not many improvements on the track with drivers focused on distance rather than speed.
Calos Sainz has improved, though, clocking 1:22.331. He remains bottom of the timesheet for now.
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Almost one hour in to the afternoon session and Max Verstappen emerges. He's got Marcus Ericsson and Sergio Perez for company on the track.
Your Formula 1 theme tune
Chris Chris: Much as I adore The Chain, ff the new Formula 1 theme is anything like as good as @BryanTylermusic, external 's Iron Man 3 end credit music I'll be happy.
Martyn West: Splash Wave from the Outrun arcade game would be a fantastic theme.
Rachel Bridge: Why would @F1, external try to compose a theme tune? Everyone knows the soundtrack to #F1, external is the bridge from Fleetwood Mac's The Chain!! Anything else is wrong!!
The track has been empty for the last couple of minutes but Sebastian Vettel gives us something to look at as he heads out in the Ferrari.
No sign of Max Verstappen yet after a busy morning in which he completed 86 laps.
Old rivalries, new faces and some very brightly coloured cars... Formula 1 is back for another season of high drama.
As the teams undertake a second round of tweaks and tinkering in Barcelona, we thought we would get some early predictions in.
It's Sunday 25 November and the Yas Marina Circuit in Abu Dhabi is bathed in the glow of celebratory fireworks. Or maybe Brazil, or Mexico, and so on...
Wherever the podium is, who do you think will come out on top? Predict your top three drivers and teams for 2018 from the list here.