Pre-season testing for the 2012 season began in earnest today, as all twelve teams took to the track at Jerez to get some mileage under their belts. It was Kimi Räikkönen who led the charge, posting the fastest time early on, and retaining his P1 position throughout the day. Nothing can be read into the times during a test, but I must admit it is nice to see someone other than Red Bull on top.

A more meaningful measure is the number of laps completed, with both Paul di Resta and Kamui Kobayashi notching up over 100 laps each. There were two red flags during the session, the first from Daniel Ricciardo who suffered an oil pressure problem, and the second by the aforementioned Kobayashi who ran out of fuel.

The teams were well represented on Twitter, with accounts covering all their progress - good or bad. Here are a couple of tweets from the day's action, starting with Caterham who had to shorten their planned running.

Testing finished for the day unfortunately. No problem with the car but a damaged starter shaft means we cant start it.

MikeGascoyne

Hey guys, to answer some questions – it was a conscious decision to run the 2011 car in Jerez... & to test the 2012 car in BCN for the first time to give more time for its development. We're currently testing the 2012 tyres in Jerez.

MercedesAMGF1

Good day of running today here in Jerez, 62laps and lots of useful information. Hoping for another productive day tomorrow. ;-)

JensonButton