(AGI) Silverstone, July 4 - Mercedes pilots Nico Rosberg andLewis Hamilton left their opponents trailing in the practiceruns on Friday for the F1 British GP in Silverstone. The twoteammates split the honour of having the fastest time, with theGerman championship leader finishing in 1 minute and 35.424seconds in the morning and Hamilton being fastest in theafternoon with 1 minute and 34.508 seconds. Both pilots racedon medium tires. . .