Lotus hoping for 'big step forward' with Silverstone upgrades

Lotus are hopeful that the package of upgrades they're introducing to the E21 for the 2013 Formula 1 Santander British Grand Prix at Silverstone will enable them to make their 'biggest step forward of the year'. Having scored a win and four other podiums in the first five races of the season, the team seemed to lose ground in Monaco and Canada

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