McLaren could 'go radical' after Silverstone

McLaren could turn to more radical development concepts if they have not made significant progress by July's race at Silverstone, according to the team's racing director Eric Boullier. The Woking-based squad introduced a number of upgrades to the Mercedes-powered MP4-29 at last weekend's race in Spain, but neither Jenson Button nor Kevin Magnussen were able to break into the top ten

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