Jenson Button has hit out at McLaren's form this season, branding their efforts so far as 'embarrassing'.

McLaren have failed to get anywhere near the from-runners this season, and sit 102 points off leaders Red Bull in the Constructors' Championship after just five races.

Button clawed his way up to an 8th place finish to earn four points at the Spanish Grand Prix with team-mate Sergio Perez a place and a point behind him.

McLaren's decision to make major changes to their car rather than developing the 2012 model which won races towards the end of the year appears to have backfired, with team principal Martin Whitmarsh in danger of losing his job if reports are to be believed.

Button admits the team's form so far in 2013 hasn't been up to scratch so far, and could see very little light at the end of the tunnel.

"It's a little bit embarrassing because we're not doing a very good job at the moment," said the 2009 World Champion.

"We are doing everything we can. Thanks for the support from the fans."

He added: "We've got a lot of work to do. There's a lot of useful information to go through from the new parts on the car and we've got some other parts coming for Monaco [the next race], too."

Button's efforts in Spain, which saw him fight back from as low as 17th to claim some much-needed points mean he is now in 10th place in the Drivers' Championship, 72 points behind leader Sebastian Vettel.

The 33-year-old strongly criticised the quickly-degrading tyres supplied by Pirelli, but was at least pleased to claw his way up the order and into the top ten.

"I got a bad start, dropping back to 17th, and I was in a whole world of pain right then," he said. "I just couldn't get any tyre temperature.

"It was a slow lap to grid for some reason. The leader can dictate pace and, when a Mercedes is dictating, it's very slow. It works for them but not for us.

"When we moved to the harder of the two tyre compounds after the first stop, the balance was much better. I overtook a Mercedes and beat some cars we didn't think we would.

"It's not fantastic, but to get through to eighth shows a good job by the team in terms of strategy."

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Formula 1