Barcelona F1 test day four
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Magnussen improves - he's third with a 1m20.428s on supersofts.
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@LewisHamilton nicks the week's fastest lap so far an hour or so from the close @Circuitcat_eng #F1Testing https://pbs.twimg.com/media/DXNt42fW4AAwonp.png
Stroll finds another couple of tenths on this soft-tyre run to get down to a 1m21.3s.
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Stroll improves, posting a 1m21.526s. He's seventh.
1m31s next time around for Hamilton as he cools everything off after that session-topping effort.
Gasly has just completed his 100th lap of the day for Toro Rosso (and Honda).
Stopwatch
Hamilton goes fastest by half a second in the Mercedes with a 1m19.333s.
Magnussen goes third on supersofts.
Another fastest sector for Hamilton...
Autosport
A pretty productive day by all accounts for McLaren, but racing director Eric Boullier says the team's running earlier in the week was hampered by a "£2 problem": 
Hamilton - still on mediums - posts a new fastest first sector.
Alonso is now 1.075s off the pace with a new personal best on supersofts - he's fourth.
Spot the mechanics readying those screens to hide the Red Bull as it returns to the pits (LAT Images)
Magnussen is next to set two personal best sectors but he ends the lap tucked up behind Alonso. A few seconds later Hamilton posts a time 0.002s shy of his best.
Alonso sets two personal best sectors, but then ends the lap a second adrift of his best.
Busy track now - Hamilton, Alonso, Perez, Gasly and Leclerc all out there with 1h20m to go.
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The only words to describe the Red Bull team members' approach to keeping cameras away from the car as it was lifted are 'genuine panic'. Quite the scramble.
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Lots of fuss down outside the Red Bull pit. While those of us looking from above can't see anything, the team is well aware that when the RB14 is lifted off the recovery truck there's a chance people could sneak a look at its floor from below. Screens are up to prevent cameras on the ground getting the view they are looking for.
Green flag
Green flag. Alonso and Gasly head straight out.
A flurry of excitement in the media centre tells us that the Red Bull - looking like every other car does when it's fully covered up - has arrived back in the pits.
The recovery team heads over to retrieve Verstappen's Red Bull (LAT Images)
The Red Bull is finally on the flatbed truck and heading back to the pits, so hopefully we'll be green again shortly here.
Here's Verstappen's stranded RB14 out on track a few moments ago
Edd Straw
Verstappen is back in the pits and explaining what happened to his Red Bull team
Information
While we're under a red flag, here's a latest lap count for you:
Vandoorne 110
Gasly 91
Vettel 84
Ericsson 79
Magnussen 67
Bottas 60
Perez 50
Hulkenberg 49
Sirotkin 47
Hamilton 39
Verstappen 34
Sainz 29
Stroll 29
Leclerc 26
Alo 12
Vandoorne 110
Gasly 91
Vettel 84
Ericsson 79
Magnussen 67
Bottas 60
Perez 50
Hulkenberg 49
Sirotkin 47
Hamilton 39
Verstappen 34
Sainz 29
Stroll 29
Leclerc 26
Alo 12
Recovery vehicles are on the scene, as is the obligatory car cover brought along by team mechanics.
That's a painful one for Red Bull. It hasn't completed many laps here today, and had only just started doing some work with the soft tyres.
Verstappen is off the track on the outside of the long Turn 12 right-hander.
Red flag
It took a while, but we now have a red flag for the beached Red Bull.
Crash
Verstappen is in the gravel!
Verstappen's first lap on softs puts him ninth with a 1m22.058s.
Sainz moves up to fourth - ahead of countryman Alonso, having switched over to the mediums.
We've not seen much - either in terms of pace or mileage - from Red Bull today, but Verstappen has just emerged on the softs.
Don't forget to check out a comprehensive selection of images from the final day of the first test in motorsport.com's Barcelona gallery: 
It's clouded over here and over the last 30-40 minutes the track temperature has plummeted from 25 degrees to 15C. Air temperature has dipped by a couple of degrees to 13C.
Here's the Haas man out on another run (LAT Images)
By: Geoff Creighton
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