We're going to take a break while the teams have some lunch. We'll be back at 13:00 GMT for more.

I'll leave you with this: Hamilton's thoughts in a press conference. Let us know your response via #bbcf1 and we'll discuss it.

Kimi stops at Turn 8published at 11:52 Greenwich Mean Time 1 March 2019

11:52 GMT 1 March 2019

We'll keep you updated with the news as to why, but that red flag is going to conclude our morning session.

James Rogers: Not even remotely interested in grown men running around a field in their shorts after a ball.

James Hutton: Can’t believe people are still talking about Lewis having the faster car last year, I thought it was widely accepted that the Ferrari was faster for at least half the races.

1. Vettel (Ferrari) 1:16.333 (60 laps)
2. Bottas (Mercedes) 1:16.561 (62)
3. Sainz (McLaren) 1:16.913 (54)
4. Kvyat (Toro Rosso) 1:17.064 (51)
5. Ricciardo (Renault) 1:17.114 (49)
6. Raikkonen (Alfa Romeo) 1.17.239 (55)
7. Grosjean (Haas) 1:17.575 (68)
8. Verstappen (Red Bull) 1:17.709 (29)
9. Perez (Racing Point) 1:17.791 (36)
10. Kubica (Williams) 1:18.993 (43)

Vettel goes quickest, again.

Image source, Reuters

And if you're interested in football, we've got some breaking news...

Since there's no Formula 1 TV feed, we've currently got the BBC Radio 1 Live Lounge (Catfish and the Bottlemen are performing an acoustic version of 'Pacifier' and it's quite good) as well as the Tour of the UAE - today is an 180km mountain stage.

Alex Dowsett, Marcel Kittel, Mark Cavendish are all racing.

Would you like updates on those too?

Flying Carlos...

Lord Roger: Maurizio’s thoughts: when I said sabotage, I meant the team, not Vettel’s car.

Luke Waterhouse: Hoping Mercedes are gonna let Hamilton unleash the Beast.

Alex Brunning: Do we think McLaren have had a word from their sponsors to just make sure they’re at the top of the timesheets one way or another all week?

SteveB:Absolutely loved keeping up to date with the testing via#bbcf1, externalPlus Mclaren seem to be on a roll!!

We love having you all. What else would we do all day?

Tom Davies: Why do some teams have red lights on their rear wings and some have green lights?

Green means rookie, red is on all cars - usually for poor weather conditions. But they're testing ALL parts, right?

Image source, Getty Images

Andrew Benson
BBC Sport’s chief F1 writer

Pierre Gasly has not had the greatest of pre-seasons in his first season for Red Bull. The Frenchman, who has a lot on his plate as team-mate to Max Verstappen, has crashed twice - once in each of the tests. He saved his biggest for last, a huge off in the super-fast Turn Nine on Thursday extensively damaging the car.

Gasly admitted he had been “a bit shaken” and admitted it was his error - he dropped a rear wheel on the grass on on turn-in, a not-uncommon error there, where the results is nearly always the same.

His former Toro Rosso team-mate Brendon Harley did it over the Spanish Grand Prix weekend last year. Gasly’s summary of testing was that Red Bull could not match the time Charles Leclerc did in the Ferrari on Thursday.

He said. “They show some good pace. We have some potential, we tested a lot of things, we have good performance, but we have to work hard as well as they seem really fast.”

Image source, Getty Images

Meanwhile... our favourite commentator is keeping busy.

Greg Dowse: Really hoping Mercedes don't have the fastest car this season. I want to see how Hamilton does when he isn't in the fastest car on the grid.

Pete Bancroft: Today could be very interesting for F1. @MercedesAMGF1 have looked slow so far but I have a feeling that it's all be a massive bluff. Wouldn't surprise me to see them suddenly pull out some blistering speed, having tricked @Ferrari into thinking they were comfortably ahead.

Bob McFeil: I’d love to see Mercedes show their true pace on the last day of #testing - put some elbow grease into the laps!

Caption your best using #bbcf1.

Image source, Getty Images

Um. Wonder what Ferrari's big boss man thought of that...

The Ferrari pit wall attracts enough attention as it is, but this morning there was an extra figure who will bring with him extra pressure. The Ferrari chairman John Elkann - who is also the chairman of parent company Fiat Chrysler Automobiles - is in Barcelona to take a look at how testing has gone.

It's the final day of pre-season and there will be a long job list of items to work through. Especially at the end of a week that saw Sebastian Vettel miss out on so much running due to his crash on Tuesday. But if you need any convincing of Elkann's importance, you only have to look at the fact that his tour guide is Ferrari team principal Mattia Binotto today.

Andrew Benson
BBC Sport’s chief F1 writer

Carlos Sainz drives the McLaren on this final day, which means Lando Norris’ work on track before Australia is done. The 19-year-old British rookie said after finishing work on Thursday: “I feel pretty prepared. I feel like I can do the job I need to be doing when I get to the first race.”

McLaren’s aim this season is to show they have progressed from a very low spot in 2018, when for much of the season they had the second-slowest car. “Some of the areas where we had quite a big weakness we’ve strengthened,” Norris said. "Not saying it’s perfect. But overall I think we have a better package to start the season with. There are still problems and things we suffer with. But I think we understand them and when we do change things the car is being affected in a positive way whereas last year we struggled a bit more to move forward.”

On Thursday, he was third fastest behind a Ferrari and a Toro Rosso, and he said the one minute 17.084 seconds lap he did was not far from their ultimate potential. “We can definitely go quicker but we can’t go seconds quicker,” he said. “We are not far from our potential. In terms of roughly where we’re at, it’s a pretty good guideline.”