Alonso , winner at Silverstone last year , had led from pole position .
Was powerless to prevent Webber powering past six laps from the end of the 52 - lap race and then take the checkered flag with a three - second lead .
Alonso , winner at Silverstone last year , had led from pole position but was powerless to prevent Webber powering past six laps from the end of the 52 - lap race and then take the checkered flag with a three - second lead .