Sebastian Vettel fastest
Hamilton completes 156 laps
McLaren's Button fifth fastest
Right, that's it from me. Sebastian Vettel finishes fastest but a monster effort from Lewis Hamilton, putting it more than double the amount of laps than anyone else. Over to you Nico Rosberg.
We'll be back with live text commentary on the second day of testing from 07:45 GMT.
Thanks for your company, see you later.
1. Sebastian Vettel (1:24.939) 69 laps
2. Lewis Hamilton (1:25.409) 156 laps
3. Daniel Ricciardo (1:26.044) 87 laps
4. Valtteri Bottas (1:26.044) 80 laps
5. Alfonso Celis (1:26.298) 58 laps
6. Jenson Button (1:26.735) 84 laps
7. Carlos Sainz (1:27.180) 55 laps
8. Marcus Ericsson (1:27.555) 88 laps
9. Pascal Wehrlein (1:28.292) 54 laps
10. Romain Grosjean (1:28.399) 31 laps
11. Jolyon Palmer (1:29.356) 37 laps
The chequered flag is out and Sebastian Vettel finishes the day one of the first test fastest.
Full times to follow.
Into the final few minutes. Sebastian Vettel's work is done, Lewis Hamilton is still out on the track, along with Daniel Ricciardo and Jenson Button.
Any late changes to the order?
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Cheers Chris! We will be back, ready to go again at 07:45 GMT so if you are up for an early start you are welcome along.
Lewis Hamilton has just completed his 150th lap - he has basically just driven from Manchester to Paris - and there's still 15 minutes to go.
Mercedes didn't even show their hand until the final test last year, but is the world champion laying down the gauntlet here.
Worth remembering that Manor's time has been set on the soft tyres. Everyone else bar Jenson Button and Alfonso Celis are on the medium compound.
Felipe Massa doesn't get the chance to get behind the wheel of the Williams until Wednesday, so he has been having a wander trackside to have a listen to the cars.
Looks impressed.
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1. Sebastian Vettel 1:24.939
2. Lewis Hamilton 1:25.409
3. Daniel Ricciardo 1:26.044
4. Valtteri Bottas 1:26.091
5. Jenson Button 1:26.860
6. Alfonso Celis 1:26.949
7. Carlos Sainz 1:27.180
8. Marcus Ericsson 1:27.555
9. Pascal Wehrlein 1:28.292
10. Romain Grosjean 1:28.399
11. Jolyon Palmer 1:31.343
Image source, Getty ImagesCan you spot Jenson Button?
Even better news for Jenson Button and McLaren. He has just gone fifth fastest with 1:26.860. That time was set on the faster soft tyres but still, an encouraging day so far for the team.
Remember they managed just six laps on the first day of testing last year.
Great scenes! Jenson Button has just completed his 66th lap. That means he has completed the same distance as the Spanish Grand Prix without breaking down.
F1 journalist Dan Knutson in Barcelona: "This is Sebastian Vettel’s company car for the test. Both he and Ferrari teammate Kimi Räikkönen are driving Jeeps. Jeep, of course in one of the brands of Fiat Chrysler Automobiles."
Two cars on the circuit at the moment - the Williams of Valtteri Bottas and Pascal Wehrlein's Manor. Wehrlein is the only driver out on the softs, with the rest having been out on the medium tyres. He currently has the eighth fastest time with 1:28.292.
It looks like Sebastian Vettel is going to finish top of the order on the first day of testing, with teams seemingly winding down for the day now.