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Martin Whitmarsh: "... we have made some initial progress and I believe up to China we will make some more."

McLaren is struggling to "understand where the car is".

Sergio Perez was the fastest driver in the Barcelona second test day. He spoke to the media about his new ride with McLaren and teammate Jenson Button.

Despite a technical problem, Jenson Button's Vodafone McLaren was almost a second quicker than the rest of the field. Mark Webber was second fastest.

McLaren's new contender for the 2013 Formula One championship fight was showcased to the world at their headquarters in England. Martin Whitmarsh recalled the past in his opening remarks.

McLaren-Mercedes Formula One launched their new challenger with the technical specifications of the MP4-28

Evolution through history: parade of classic McLaren racing cars heralds launch of new Vodafone McLaren Mercedes MP4-28

McLaren will launch its 2013 Formula One car on Thursday 31st January. Watch the trailer.