Jenson Button says he endured an 'embarrassing' Belgian Grand Prix after a problem with the ERS consigned him to an afternoon running off the pace at the back of the field.

Starting on the back row of the grid after taking a series of penalties for various component changes, Button's McLaren-Honda developed a problem that would prevent him from deploying his ERS, leaving him underpowered from Eau Rouge to Les Combes.

Finishing more than a lap down in 14th position, Button says it is 'embarrassing driving around at the back', but laments he wouldn't have had much pace anyway.

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"I've got nothing to take out of today," he said. "I had a problem with the front rear deployment with the ERS pack, so the moment I got to the top of Eau Rouge I had no deployment all the way down the straight and the same with the back straight.

"I don't know why that was, we're looking into it, but it was for the whole race not working correctly. So when you're just running on a petrol engine - there's not a lot of power there compared to other people with electric motors as well. Tough day, embarrassing really driving round at the back."

"I mean the pace isn't good anyway, as we saw with Fernando, when you haven't really got any deployment on the straights, it's a lot of power really. I was just basically driving around and keeping on the black stuff."