We've seen improvements this weekend from drivers on their second runs on the ultrasofts, so let's see if that's the case with Lewis Hamilton and Nico Rosberg now...

It's P1 for Lewis Hamilton as he does 1:41.065. Nico Rosberg can't beat that, going a tenth of a second slower.

Hamilton, as he has all weekend, is looking on it.

Nico Hulkenberg is out on the track after Force India sorted out his fuel system issue.

Meanwhile, Lewis Hamilton and Nico Rosberg are back out now and have the ultrasofts on, so they'll be doing their qualifying sims now.

Image source, AP

Still we wait for Nico Rosberg and Lewis Hamilton to head back out. Neither have done a qualifying simulation run, having set their times on the supersofts.

Kimi Raikkonen goes quickest of all on the ultrasofts, doing a 1:41.700. Daniel Ricciardo is second quickest, a tenth of a second down on the Ferrari having also done his lap on ultrasofts.

Image source, EPA

Alex Sawczuk: Adelaide, Suzuka, Interlagos all did great jobs. Abu Dhabi is about as boring as they get though.  

Jan Sergeant: Spa - changeable weather conditions, challenge for drivers and car.

Henry Chapman: the best track to hosts finale would be Suzuka as it's an awesome track or Brazil because if it's unpredictable weather.  

Image source, Rex Features

Tom Clarkson
BBC Radio 5 live commentator

Lewis Hamilton is sat waiting to go out again. He's having some ultra softs put on so will be out doing some quick laps again soon. Nico Rosberg, meanwhile, is very much focused on the race tomorrow. He has already done two practice starts from the Mercedes pit box. 

Andrew Benson
Chief F1 writer in Abu Dhabi

Sebastian Vettel admitted on Friday that it would be nice to end what he admitted had been a “tough year” for Ferrari with a positive result and so far it is looking good. Ferrari were mixing it with Red Bull through Friday and Vettel said: “Overall the car felt good so we should have good pace. Hopefully put the car where it belongs in qually and we should have a good race.”

Sebastian Vettel improves at the top of the timesheet with 1:41.957 as Nico Rosberg moves up to third.

"A little bit of pull on braking," says Rosberg. Both he and Lewis Hamilton will want things to be absolutely on point with their set up this weekend.

John Neese: Spa or Suzuka 

Craig Stevanato: Interlagos. Great track for overtaking, unpredictable weather, thousands of truly passionate fans, challenging track to drive.

Zayyad MK never been a fan of Monaco but it'll provide a huge challenge for a finale  

Image source, Rex Features

Lewis Hamilton returns to the pits to get whatever problem he's just had sorted.

Meanwhile, there's a brief flutter of the yellow flags as Carlos Sainz spins towards the end of his lap. He's the only man out on supersofts.

"Lost power," reports Lewis Hamilton.

Uh oh...

Image source, Getty Images

Jenson Button has been getting all sorts of lovely messages from friends and colleagues as he prepares for his final race in Formula 1.

McLaren have done a leaving card on their website, with a few nice memories from Button's team members. Here's a couple I like that highlight the person he is off the track.

“My memories with Jenson is shaking his hand in the restaurant. It was like touching god! I will miss him so much.”  

"My family went to the Austin F1 race in 2014 for a surprise birthday party for my Father’s 60th. My Dad got to meet and talk with Jenson at the McLaren Automotive VIP party. Jenson was so polite and welcoming to a complete stranger, and that left a great impression on my father. I have this lasting picture in my head of my father and Jenson chatting and carrying on as if they were friends. It was truly the best birthday present I could ever give my Dad.”

Have any personal memories of meeting Button? It'd be great if you could share them. Ping them over to #bbcf1, external

The two Red Bulls split the Mercedes, with Daniel Ricciardo second quickest. Once again, they look the most likely to be mixing it up with the Mercedes in qualifying later, with Ferrari behind them.

Sebastian Vettel has actually just gone quickest, doing a 1:42.034, but he's on the ultrasofts. That time is just 0.086s quicker than Hamilton, who is on the slower tyre compound.

Several times up on the board now, with Lewis Hamilton quickest after a 1:42.120. Nico Rosberg, meanwhile goes P4 with his first effort, half a second down on Hamilton.