Romain Grosjean has a hairy moment as he straighten up the car only to find his back end wobbling all over the place. The Frenchman manages to hold it together though.

Daniel Ricciardo's Red Bull goes quickest with a 1:48.189 - that's one tenth slower than team-mate Max Verstappen's quickest time yesterday.

Ricciardo has the Ferraris of Kimi Raikkonen and Sebastian Vettel behind him and then Nico Rosberg in fourth.

Lewis Hamilton is down in 20th - but he has no need to practise qualifying runs.

Image source, Getty Images

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Tom Clarkson
BBC Radio 5 live commentator

I would say there is a 40% chance of a safety car in this race and that would bunch the field up and help Lewis Hamilton. Anything could happen, but I think he would require a safety car.

"What an idiot? You see that?" says Sebastian Vettel on the radio, with a bit of potty-mouthery thrown in for good measure.

The Ferrari man is unhappy with Kevin Magnussen's position at Blanchimont.

Image source, Getty Images

Ferrari have taken the lead, with Kimi Raikkonen top on a 1:48.406 and Sebastian Vettel a tenth further back.

That bumps Nico Rosberg down to P3, half a second behind.

Lewis Hamilton is warned by his team about track limits - stewards have made it clear they will be cracking down on anyone coming off the track at the exit of Eau Rouge.

The BBC Radio 5 live commentary team are asking you for your favourite corner names.

Jorge Koechlin: Goose Neck at Cadwell Park

Strong start.

Image source, AFP

The hot temperatures this weekend have been a pleasant surprise for many of those attending the race, who would have been expecting the usual mix of coolish weather and occasional rain.

But for the teams, they are not proving so welcome.

Their tyre choices have focused on the expected cool weather, with the super-soft, which has never been used here before much in evidence - especially at Ferrari, who have chosen seven sets of it for each of their drivers and only one set of mediums.

But degradation on the super-soft is very high - some drivers spoke of it struggling even to do a lap in the heat. Mercedes have gone the opposite extreme with a much more balanced choice - only four sets of super-softs for Lewis Hamilton and Nico Rosberg. It remains to be seen whether this will have any effect on the weekend. But Sebastian Vettel did not sound worried. “It should be fine the strategy we have for tyres,” he said.

Teams are certainly not going hell for leather in final practice, but with the soft tyres struggling to cope with heat, it's probably down to preservation.

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Only 11 cars have set times - Nico Rosberg remains top with a 1:48.880 and followed by Valtteri Bottas and Nico Hulkenberg.

Meanwhile, Max Verstappen's car is in the garage and up on the stilts and they're pulling apart. Not a good sign for the Red Bull driver on his 'home' track.

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Increasingly this season, the impression has been of them falling backwards - some would even say they have been ‘found out’ as the engines have equalised and the advantage they had from running a Mercedes since 2014 has diminished.

It could also be that what is playing out is a function of them diverting their limited resources earlier to 2017 than others in an attempt to steal a march. Whatever the explanation, they are definitely struggling.

Valtteri Bottas and Felipe Massa finished Friday 16th and 17th and the Brazilian spoke of “a very long evening to fix the problem”, adding that rivals such as Force India and McLaren “had a good Friday and we didn’t”.

Which analysis would come as a surprise to McLaren’s Fernando Alonso, who missed the entire first session because of an engine problem. Bottas sounded less concerned, though. “If you look at the lap times, it looks pretty bad,” the Finn said.

“But when I went with the super-soft, everyone went on high fuel and I got stuck in the traffic. It didn't feel too bad. I'm sure we can still make the car quicker, make it better balanced. I'm still hopeful that on Saturday we're going to be a long stronger and definitely well in the top 10.”

Here's today's view from the commentary box. There's worse places to spend a day's work!

My maths was wrong - it's now a 55-place grid penalty for Lewis Hamilton. Not that it makes any difference, he could have a 1.7 million-place grid penalty and would start in the same place.

Andrew Benson
Chief F1 writer at Spa-Francorchamps

Image source, Getty Images

As F1 left Germany at the close of the first part of the season, there was little doubt that Ferrari had hit a low.

Second place in the constructors’ championship had been surrendered to Red Bull, technical director James Allison had left and the car was losing competitiveness.

A four-week break has - so far, on the face of it - changed little. Sebastian Vettel was the fastest Ferrari on Friday, but in fourth, and nearly 0.4secs slower than a Force India.

The car had looked wayward on track. And Vettel admitted he had been struggling. “It was a very tricky day,” he said.

“It is very hot for Spa, and so it’s very slippery out there. But I think in general, everybody was struggling to make the tyres last and sliding quite a lot. It doesn’t matter which tyre you have, it’s the same for everybody, so we need to try and work on that because the temperatures will be like this for the whole weekend.

"Also, I was struggling a bit with the balance of the car, but this is up to us. We need to improve the car. It is not yet where we want it to be. But I am sure we will be faster.”

The stewards will investigate the incident between Esteban Gutierrez and Pascal Wehrlein.

Wehrlein believed Gutierrez did not give him enough space on the inside as he came out of Eau Rouge.

No sign of Lewis Hamilton yet but Mercedes team-mate Nico Rosberg has clocked the quickest time on soft tyres - a 1:48.880.

Romain Grosjean and Felipe Massa follow.

Image source, Getty Images

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Andrew Benson
Chief F1 writer at Spa-Francorchamps

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Manor’s Pascal Wehrlein turned a few heads with the 11th-fastest time on Friday afternoon. Team boss Dave Ryan admitted it was not representative of their true pace but did say they hoped to be on the cusp of getting into second qualifying on Saturday afternoon - and that they felt they could make it with one car.

But which one? New boy Esteban Ocon, drafted in for the second half of the season after Rio Haryanto’s money ran out, was nearly a second off Wehrlein in the second session, but that was an almost exact reversal of their positions in the first session.

Ryan explained they had been on divergent programmes, the idea being to bring everything together for qualifying.

Ocon has impressed on his first day with the team and if he can be close to Wehrlein it will be highly impressive. They are effectively now in a showdown to be the favoured Mercedes protege.