Not seen anything from Fernando Alonso this afternoon. McLaren tweeted the below picture just before lunch. 

I presume Alonso isn't still struggling with his belt, so something else?

Image source, McLaren

Lance Stroll is quietly going about his business and is up 23 laps for the afternoon in the Williams. 

Meanwhile, Marcus Ericsson - another driver joining the action this afternoon - gets his first timed lap in with a 1:25.600 on medium tyres. That puts him bottom of the pile for now.

1) Valtteri Bottas (Mercedes) - 1:19.310 - supersoft

2) Felipe Massa (Williams) - 1:19.420 - ultrasoft

3) Kimi Raikkonen (Ferrari) - 1:20.406 - soft

4) Max Verstappen (Red Bull) - 1:20.432 - soft

5) Lewis Hamilton (Mercedes) - 1:20.702 - soft

6) Nico Hulkenberg (Renault) - 1:21.213 - supersoft

7) Sergio Perez (Force India) - 1:21.297 - supersoft

8) Carlos Sainz (Toro Rosso) - 1:21.872 - soft

9) Romain Grosjean (Haas) - 1:22.4428 - soft

10) Lance Stroll (Williams) - 1:22.510 - soft

11) Pascal Wehrlein (Sauber) - 1:23.000 - soft

12) Fernando Alonso (McLaren) - 1:23.041

Zubs: Would love to see how fast the @MercedesAMGF1, external can go when the engine is turned up to full power. 2 seconds faster maybe?  

Lewis Hamilton is back out and goes quicker than his previous best from this afternoon with a 1:20.702, again done on softs. He is up to fifth.

No sign of Max Verstappen and it might be a little while before we do see him this afternoon. Red Bull have just confirmed an engine change during lunch.

Lewis Hamilton pits after getting five laps under his belt, leaving Carlos Sainz alone on the track at the moment. 

Toro Rosso really need to up their lappage. They completed the fewest amount of laps over the four days of last week's first test with 183 and have done 154 so far this week. Felipe Massa does that in his sleep.

Image source, Getty Images

Kayleigh: I'd have it written in my contract that I can drive my title winning car as if it was a road car   

Chris: I'd try and defend my #f1, external title rather than retire early. Each to their own I guess....  

Richard Stephenson: Yacht, Med, Sunshine, reading Johnny Herberts new book... with a glass of something cold.

Lewis Hamilton moves above Carlos Sainz and into seventh as he improves with a 1:21.371.

Meanwhile, a trouble-free seven-lap outing for Lance Stroll before he heads back to the pits. Happy days.

Chris Marsh: 13.29 At least Nico's keeping to a racing line. That's the tunnel in Monaco.  

Speaking of world champions, the 2015 champion heads out for the first time today.

Lewis Hamilton has got supersofts on his Mercedes and gets going with a 1:22.033, putting him eighth.

Yesterday he had a tough day - by his standards - because of a damaged floor. Smoother sailing today?

If you were the recently retired would champion, how would you spend the year while the rest of the F1 field scrap it out for your crown? 

Let us know via #ifIwerechampion, external

I'm always curious to see what the world champion is up to when usually they would be out there, going round and round in circles under the Spanish sun.

Nothing today it seems for Nico Rosberg, but he was recently out running AND taking a selfie at the same time. Multi-tasking.

Image source, Nico Rosberg/Instagram

Sergio Perez kicks off the afternoon with a 1:22.839. Meanwhile, Lance Stroll has emerged onto the circuit for the first time this afternoon.

There's a couple of different drivers in action this afternoon. Lance Stroll gets his first run out of the week as he takes over from Felipe Massa while Lewis Hamilton is back behind the wheel of the Mercedes. Can he beat his team-mate's time this afternoon?

Jolyon Palmer is due to take over from Nico Hulkenberg in the Renault while Marcus Ericsson is in for Pascal Wehlrein in the Sauber as well.

Sergio Perez has saved you all from my inane ramblings by heading out onto the track. Thank you, sir.

The Force India driver has the red-walled supersofts on so could be winding up for some quick-lap antics.