(AGI) Rome, July 5 - Mercedes's Nico Rosberg won pole positionin the British Grand Prix ahead of Sebastian Vettel with RedBull. Ferrari's performance skimmed disaster and finished in18th and 19th position, the worst start since the beginning ofits history. Mercedes's German driver stopped the clock at1'35"766, winning in his career's eighth pole position and theseason's fourth after Bahrain, Monaco and Canada. Rosberg willstart on the front row next to Sebastian Vettel, who broughthis Red Bull back into the first row after winning the secondrow in the Malaysian Grand Prix qualifications. . .