Hamilton currently fastest, Rosberg stops with technical problem
Hamilton significantly faster than Rosberg on long-run pace
Safety fears ahead of second practice after tyres cut on kerbs
Several cars spinning off difficult track
Hamilton fastest in first practice, Ricciardo crashes into wall
Jennie Gow
BBC Radio 5 live pit-lane reporter
"I'm sat on a packing crate with a few of the Mercedes crew and they are going through the same thing as us - they are watching the big screens and all of a sudden they see their guy pulling over. They suddenly whip their helmets on and get ready to act on the issue".
The yellow flag is gone and we're back at full pelt.
Rosberg's issue has brought out a yellow flag and a virtual safety car.
Argh. Speaking of Nico Rosberg, he's stopped on the track.
"Stop stop stop!" comes the message from his team down the radio.
The German is out of the car and watching it being wheeled around by stewards.
Image source, APAndrew Benson has done a bit of wonder maths.
On these long runs, Lewis Hamilton is nine tenths of a second a lap quicker than his team-mate Nico Rosberg.
Breaking news. There's a foil packet on the track.
Early reports suggest it is a bag of crisps, but we can't rule out pork scratchings just yet.
Jack Nicholls
Radio 5 live Formula 1 commentator
"I don't want to go to Dehli and Sepang and Abu Dhabi all the time. I want to see when a driver makes a mistake, there are consequences".
Fernando Alonso's McLaren has been patched up and the man to win the most recent European GP climbs a position to 11th.
He moves Romain Grosjean down a spot - but that's credible in the Haas.
Step aside everyone, you're about to be blown away.
Kimi Raikkonen is out on super softs.
Half an hour to go and Lewis Hamilton still leads.
It's not the end of the world, but you fancy that Nico Rosberg needs a bit of a pick me up after watching Hamilton win the last two races and close his championship lead. If he can gazump his team-mate today, it might put a spring in his step.
"I'm getting a lot of beeping my ears," Lewis Hamilton tells his team on the radio.
The beeps generally tell drivers to change settings - but it seems Lewis is getting more beeps than usual.
Commentator Tom Clarkson suggests it could be Sebastian Vettel's potty-mouth going into his earpiece. Or Daniel Ricciardo's, perhaps.
Are Ferrari telling the whole story there? Sebastian Vettel is TWO SECONDS slower than Lewis Hamilton. Can that be solely down to the tyres not marrying up with the car?
Jennie Gow
BBC Radio 5 live pit-lane reporter
"Having said there is no way they will tell us anything, because they never tell you anything at Ferrari, I have found out some stuff!
"It seems like they are having some issues turning their tyres on. Now we all know how sensitive these tyres can be. On one car, you get a tyre that responds incredibly well. On another car, because of the way the car works, even the way they heat them up in the tyre blankets, that can mean they don't work. Apparently Ferrari are having a few issues with that."
Here's a puzzler.
The Williams of Valtteri Bottas is in P4.
The Williams of Felipe Massa is in P16 - 1.3secs down on his team-mate.
Answers on a postcard please.
Image source, Getty Images
Andrew Benson
Chief F1 writer in Baku
Renault have had a torrid time in the last couple of races, with Jolyon Palmer writing off a chassis with his massive crash in Monaco and Kevin Magnussen damaging one with his strange accident in Montreal. Palmer was at pains here in Azerbaijan to emphasise that the car’s characteristics are not helping.
‘Obviously it doesn't make us look good if we crash the car,’ he said, 'and when the car's difficult to drive there's a higher chance to crash it. I've only crashed the car one weekend this year - which was Monaco - but I did have quite a big one in the race, which was quite a unique situation, and practice I had two more as well. So Monaco was a very bad weekend but forgetting that one, I haven't crashed the car. And Kev had one in Montreal. It's not like we're complete crashing drivers.
‘The car's difficult, especially on bumpy circuits.We're clearly missing a reasonable amount of downforce when you compare it to the Red Bull, which is probably the best car on the grid,’ he said. ‘Missing downforce plus being very edgy and difficult over the kerbs means it's extremely snappy. Especially in Montreal and Monaco over the bumps we were struggling. The bumps are where suddenly the car can spit you and doubled with that, the walls are very close so I think that it exaggerated it.’
Jennie Gow
BBC Radio 5 live pit-lane reporter
"I am wondering what Ferrari are up to today... Whatever they brought to the game in Montreal, whatever they managed to find which seemed to be a massive step forward for Ferrari in that engine, it seems to have absolutely disappeared.
"I just wonder what they are up to but there is absolutely NO WAY, by the way, if you asked me to go down there and ask them, there is absolutely NO WAY they would tell me what they are up to."
Carlos Sainz has a 2015 Ferrari engine in his Toro Rosso. He's one tenth quicker than Sebastian Vettel and six tenths quicker than Kimi Raikkonen.