1. Nico Rosberg 1:23.022 82 laps

2. Valtteri Bottas 1:23.229 100 laps

3. Kimi Raikkonen 1:24.836 55 laps

4. Daniil Kvyat 1:25.049 47 laps

5. Fernando Alonso 1:25.252 79 laps  

6. Max Verstappen 1:25.356 130 laps

7. Kevin Magnussen 1:25.760 101 laps    

8. Nico Hulkenberg 1:25.954 113 laps

9. Esteban Gutierrez 1:26.661 23 laps

10. Felipe Nasr 1:26.821 90 laps  

11. Lewis Hamilton 1:27.043 71 laps

12. Rio Haryanto 1:29.593 34 laps

Image source, Getty Images

Kimi is back! After his time on the circuit was cut short earlier this afternoon when Ferrari was stuck in eighth gear, Kimi Raikkonen is finally back out on the circuit as we enter the final hour.

Rio Haryanto, Nico Hulkenberg and Max Verstappen are also out there.

Nico Rosberg had his say on Formula 1's new qualifying system at lunchtime and he clearly isn't happy with the way it has been dealt with.

A constant elimination style format has been agreed but won't be introduced until round five of the season.

"It's not very professional the image they are giving with that, going back and forth," says Rosberg.

"That's such a major change. It's good that we are thinking about it. It's important to bring them in as soon as possible."

Lewis Hamilton and Nico Rosberg effectively shared driving duties on a road trip fro London to Istanbul last week as Mercedes were putting in the miles in the first test and focusing on reliability.

It has been a change of pace for the pair today, with Rosberg doing some qualifying practice this morning, while Hamilton has spent this afternoon doing a race sim, which has come to an end as he pits after completing 71 laps this afternoon.

F1 journalist Dan Knutson in Barcelona: "Kimi Raikkonen has not been out on the track since his Ferrari had to be brought back on a flatbed truck. Apparently the gearbox is stuck in eighth gear."

Image source, Getty Images

Still no sign of Kimi Raikkonen after he brought out the red flag earlier this afternoon. Time is against the Finn, with one hour and 20 minutes of the session remaining.

1. Nico Rosberg 1:23.022 82 laps

2. Valtteri Bottas 1:23.229 90 laps

3. Kimi Raikkonen 1:24.836 47 laps

4. Daniil Kvyat 1:25.049 32 laps

5. Fernando Alonso 1:25.252 70 laps  

6. Max Verstappen 1:25.356 111 laps

7. Kevin Magnussen 1:25.760 86 laps    

8. Nico Hulkenberg 1:25.954 97 laps

9. Esteban Gutierrez 1:26.661 23 laps

10. Felipe Nasr 1:26.821 78 laps  

11. Lewis Hamilton 1:27.043 56 laps

12. Rio Haryanto 1:29.593 25 laps

McLaren confirm a telemetry glitch was the reason behind Fernando Alonso stopping just before lunch. The Spaniard is making up for lost time and up to 69 laps for the day.

Lewis Hamilton's first flyer of this stint sees him clocking his fastest time of the day so far - a 1:27.043 which moves him up to 11th.

Lewis Hamilton has just pitted for another set of mediums and has 20 laps to go in what would appear to be his race sim.

Meanwhile, Max Verstappen is piling on the mileage - 110 laps and counting for the Toro Rosso driver.

Andrew Benson
Chief F1 writer

Towards the end of last year, Pirelli talked about wanting to re-introduce a so-called “cliff” into the tyre’s behaviour - a sudden drop-off in performance after a certain amount of life. The idea being to try to promote more pit stops. But it doesn’t seem to have worked. Teams and drivers reported after the first test that this sudden cliff did not seem to exist.

Lewis Hamilton said earlier: "There’s not much of a cliff to be honest; they behave very similarly to last year. There is a little bit more deg maybe on the left-front tyre but generally it’s nothing exciting or nothing new that will make a difference." Hamilton went as far as to say he “preferred last year’s” tyre. 

Renault’s Kevin Magnussen said he could feel the layer of harder rubber that has been inserted into the tyre to create the cliff - but that it did not have the desired effect: “There is a new hard layer on the inside of the tyre which is a bit strange and takes some getting used to. When you hit that, the balance changes a lot. I didn’t really feel a cliff. You just feel a massive difference in balance.”

No more running for Esteban Gutierrez as the team confirms "fuel system issues" have ended his day early.

Gutierrez had completed 23 laps this morning.

F1 journalist Dan Knutson in Barcelona: "Here is something to watch out for during what we assume to be Lewis Hamilton’s race simulation. He did 10 laps on the soft Pirelli compound, switched to mediums, and then switched to a second set of (scrubbed) medium slicks with 36 laps to go. 

"The drivers are allowed to use three different compounds during the races this year. We might see Hamilton duck into the pits near the end of his run for some super soft, or even ultra soft, tyres."