Lewis Hamilton said he was happy with his first day of running back behind the wheel of an F1 car after taking over McLaren's programme for the second day of testing in Valencia.

Hamilton continued the programme started by test driver Gary Paffett on Tuesday as the team worked on gathering data on the new Pirelli tyres using a development version of last year's MP4-25.

While the Briton admitted it was difficult to replicate the downforce levels expected for the new season using the old car, he was still happy with the work done with the Pirelli rubber on what will be his only day of running this week as he posted the fourth fastest time.

Jenson Button will complete McLaren's programme on track tomorrow.

"It felt great to be back in the car," Hamilton said. "I haven't been driving for a while, so it felt good to brush away the cobwebs, and I felt at home straight away.

"Even though we were using the 2010 car, we had quite a productive day. We were trying to replicate 2011 downforce levels on the old car - so it wasn't 100 per cent accurate - but we still got a good understanding of the new Pirellis and covered quite a lot of ground.

"The new tyres are easy to get a feel for; there's not as much grip on the Pirellis as we had last year; they drop off quite a bit, too, and they're a little bit harder to control over a longer stint - but it's the same for everybody."

To view times from testing, CLICK HERE.