Good afternoon, and welcome to our LIVE coverage of the Brazilian Grand Prix.

Rosberg and Hamilton have been trading fastest lap times - Rosberg currently doing better on that front.

Grosjean and Nasr are embroiled as they push for some actual points today.

The Mercs are well in front and enjoying their space for the time being.

Sainz has finished. No power, and he's stranded on the track.

Sainz is going - at the back of the field.

Hamilton is nudging at Rosberg into Turn 1, but he manages to get some space as he pulls away.

Here we go!

Formation lap time, and Carlos Sainz is still having problems with getting his car to actually start.

It's followed by the Brazilian national anthem.

A well-observed minute's silence, with a French flag held up on the grid along with the "wall of remembrance" for victims of road traffic accidents.

Grid guys and girls out at Interlagos today. A pleasing if unusual sight.

And the word is that Lewis Hamilton's car has a touch of trouble on the gear box.

Carlos Sainz has come to a halt out there on the track and is causing a heck of a lot of traffic.