Jenson Button has admitted that he is uncertain as to how far McLaren has moved forward after trialing the team's substantial Spanish Grand Prix upgrade package, with early wet weather conditions limiting representative mileage during Friday practice. The Briton, who finished the day just ahead of team-mate Sergio Pérez in 12th place, believes the outfit now has a clearer understanding of the correlation between its wind tunnel and the track, but does not yet know where it stands compared to rival outfits. "As with any test of an upgrade package, there are positives and negatives to take away from today," said Button. "There’s now a better understanding of the correlation...
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