Hello and welcome to our live text commentary of the first practice session ahead of the Indian Grand Prix.

Every car has completed an installation lap now and again the track goes quiet as the teams continue their analysis of the date collected.

Vergne and Webber break the silence as they head back out onto track.

Like going to watch F1 races live? Well, it's going to get even more expensive next season, according to Mercedes principal Ross Brawn.

Formula 1 supremo Bernie Ecclestone has said he is prepared to go to court to fight a claim from German bank BayernLB over a £320 million payment it is seeking.

Time, perhaps, to catch up on a little news in the world of F1.

Absolutely quiet on the track now, with all cars back in their respective garages.

Paul Di Resta on team radio: "There's not much grip at all."

Flow-vis is very much in evidence in this first session today, not least on the Ferrari of Felipe Massa.

Gutierrez is back in the garage, having made his Sauber debut. Perez looks on from the back of the garage. He's got a cold, apparently, nothing too serious and he should be back for FP2.

Lewis Hamilton's the first big name out there in his gleaming McLaren.

Vergne and Ricciardo were the first out onto the track in their Toro Rossos.

Our man in the paddock Will Gray asked a pertinent question this week: how can Ferrari halt their slide?

Another change, although one that we've come to expect, is Valtteri Bottas in for Bruno Senna in the Williams.

So, here we go with an hour and a half of the first free practice session!

We're just about to get underway for 90 minutes of testing - before we do, get yourself up to speed with the New Dehli track with our race guide.

Mark Webber's ruled out gifting an Indian Grand Prix victory to championship-leading Red Bull team-mate Sebastian Vettel.

There's been a late change to the line-up for this session: Mexican test driver Esteban Gutierrez will replace sick compatriot Sergio Perez in first practice for Sauber.

It's a bit hazy around the track today, but the sun should burn off whatever cloud is still around as the day progresses.