He should have finished fifth, but he had run an extra lap by mistake and was placed seventh.

WSJ: Social Media

That meant his main hope of holding off the Ferrari driver was to build a lead big enough before his stop on lap 10 that Raikkonen could not close it on his extra lap.

BBC: Hamilton stripped of Belgian win

It is feared any potential benefits from the extra boost of 80bhp for up to six seconds each lap will initially be negated by the system's weight (on average 35kg) and its knock-on effect on balance, weight distribution and reliability, not to mention the cost and anxiety over its safety.

BBC: F1 teams face testing times

That is equivalent to having an additional 80 horsepower (the extra 10%) on tap for six seconds or so during each lap.

ECONOMIST: Tech.view: Boost for Formula One | The