Barcelona F1 test day one

Vettel also stays out, completing a much slower run past the pits, and hitting the brakes hard at the start/finish line. He didn't quite come to a stop, but it briefly looked like he was lining up for a practice start!

Bottas charges past the pits - aero measuring kit attached in front of the sidepods - to start the first 'flying' lap of 2019 testing. No messing about from Mercedes, as we've become accustomed to on day one of pre-season in the last few years.

Grosjean and Vettel join Bottas on track to kick things off.

Bold statement as always from Mercedes - sending Bottas down to the end of the pits before the session even begins!

Ferrari has just given the SF90 a quick fire up. We had a cracking view of it

Another view of the Alfa, and proof that it has changed a little bit at least

We were hoping for a bit more of a change to be honest!

Alfa Romeo time...

While we wait for the Alfa Romeo to appear in the pits, check out what our technical editor Jake Boxall-Legge made of the early shots of the car we saw last week, including THAT front wing: 

Haas showed us a 2019 front wing in the flesh when it kicked off launch season, but we'd only seen renders of its full car until now. The real thing is now on show in the Barcelona pits

Another piece of the 2019 car-looks puzzle: Red Bull has revealed its utterly brand new colour scheme for this year. We preferred the shakedown livery...

What are the big stories on our minds heading into the start of testing today? Edd Straw and Scott Mitchell discussed the key topics they'd be looking out for before they set off for Spain over the weekend:

We've seen every team in some form already - either with real cars, renders of their 2019 designs, or just new liveries. But there are a few unveils we're still on the lookout for to complete the set: We'll have the definitive 2019 Haas design on show in the pits in a little over 10 minutes, and in about half an hour the Alfa Romeo will be rolled out for the media - we've only seen that in a funky Valentine's Day livery so far. We've only had a 2019 livery launch from Racing Point so far, so we'll be on the lookout for this year's car appearing this morning as well. Another team that has only given us a livery reveal so far - Williams - is not scheduled to run today as its car is not quite ready.

It's finally here - day one of F1 testing 2019. Welcome to our live coverage, which we have opened especially early today because we are just as keen as you are.