Postpublished at 13:15 British Summer Time 6 September 2015
David Coulthard
BBC F1 co-commentator
"It's a sorry state of affairs, Jenson doing everything he can but unquestionably the Honda power unit the worst out there."
Hamilton keeps win after investigation over tyre pressure
Vettel 2nd, Massa 3rd, Bottas 4th, Raikkonen 5th
Hamilton told to push by team in closing stages despite big lead
Rosberg out with engine failure
Grosjean, Maldonado, Alonso out
Gary Rose
David Coulthard
BBC F1 co-commentator
"It's a sorry state of affairs, Jenson doing everything he can but unquestionably the Honda power unit the worst out there."
Jensnon Button's brief foray into the points places is over, at least for now, as Carlos Sainz and then Daniel Ricciardo get past the McLaren. Button is now down to 12th.
Kimi Raikkonen is trying to climb back up the field after that shocker of a start and he passes Carlos Sainz at the first chicane to move into 10th. He is more than 20 seconds behind Lewis Hamilton. Plenty to do.
Bernie Austin: Did the Iceman melt under pressure?
Adam: Terrible luck for @Lotus_F1Team, external they looked good for some points today.
Anthony Hueston: Kimi caught taking a nap on the grid.
Welsh Racer: oh Kimi *facepalm*
Lewis Hamilton is 2.7 seconds down the road from Sebastian Vettel after five laps. All Ferrari's hopes are now pinned on the German in his first race at Monza for the team.
Ben Edwards
BBC F1 commentator
"McLaren-Honda are definitely lacking straight-line speed and it's going to be tough for Jenson Button to stay where he is right now (ninth)."
There is movement in midfield too with Jenson Button up into the points. From 15th he is up to ninth, with Carlos Sainz behind him.
Ben Edwards
BBC F1 commentator
"After the delight of the podium finish in Belgium, misery for Lotus here at Monza."
All over before it really started for Lotus. Romain Grosjean pulls over to the side of track and is out of his Lotus while Pastor Maldonado has also retired.
What's happened here? Nico Rosberg, for the fourth race in row, did not get away well at all and he is down in sixth.
Lewis Hamilton leads from Sebastian Vettel, Felipe Massa, Valtteri Bottas and Sergio Perez.
David Coulthard
BBC F1 co-commentator
"Raikkonen, it looked like he went into anti-stall. The car didn't move as the lights went out."
LIGHTS OUT! Disastrous start for Kimi Raikkonen, the car doesn't move as the lights go out and he drops right to the back of the field as he finally gets under way.
Lewis Hamilton holds the lead into the first corner, with Sebastian Vettel behind him.
David Coulthard
BBC F1 co-commentator
"Ferrari have clearly done a strategy to help Raikkonen over Vettel in qualifying. How is that going to play out in the long run to the first corner?"
One final reminder of how the grid lines up:
1) Hamilton 2) Raikkonen 3) Vettel 4) Rosberg 5) Massa 6) Bottas 7) Perez, 8) Grosjean 9) Hulkenberg 10) Maldonado
11) Nasr 12) Ericsson 13) Stevens 14) Merhi 15) Button 16) Alonso 17) Sainz, 18) Kvyat 19) Ricciardo 20) Verstappen
Lewis Hamilton leads the field off on the formation lap. Here we go then...
Allan McNish
BBC Radio 5 live analyst
Quote MessageMercedes might be leading the world championship and in dominant fashion but they are not letting off in terms of developments. They have brought a new rear wing. We saw in Spa they had already developed this new system with a big swoop and that allows a better airflow and a better efficiency of downforce. However, at Monza it is more important for straight-line speed so they have made that whole top section smaller. That allows them to have an even higher top speed but still have that important downforce level.
Watch the full video as Allan McNish explains how F1 teams get extra speed in Italy here.
Allan McNish
BBC Radio 5 live analyst
"Lewis Hamilton is going to have to work for it. He is going to have to really focus on the start. It's quite a long run but it's also a tight one and there is always an incident."
Andrew Benson
Chief F1 writer at Monza
“Some strategy chat for you. This should be a one-stop race, but it’s not easy to make the tyres go that far so there will be some management to be done - and the higher the track temperature the harder it gets. Two stops is not attractive at least partly because the total time loss for a pit stop is one of the highest of the season at 25 seconds or so, because of the length of the pit straight and the speed the cars go down it.
"But if there is a safety car, a two-stop becomes more attractive because the time loss for a stop is greatly reduced. Mercedes are expecting a strong challenge from Ferrari, whether or not Lewis Hamilton gets away in front.
"And there will be plenty of nerves in the garage over whether Hamilton’s engine will last the race.”
Star Wars director George Lucas is a guest of the Mercedes team today and has just been chatting to Radio 5 live's Jennie Gow, telling her: "It's very fascinating and very intense. There have been some great races this year and real drama. It's going to be a great race today - these guys are not going to pussy-foot around at all."
Kristine Kirby: The penalties are so silly now - 50 grid spots - some cars should technically be starting at the Italian-Swiss border.
Yuri: Good luck to everyone at the #ItalianGP, external Will definitely be supporting my Brazilian @MassaFelipe19, external
Mat Page: Surely the wouldn't take Monza off the #F1, external circuit after 2016