Lewis Hamilton fastest in first practice at Silverstone
Formula One world champion Lewis Hamilton laid down a marker with the fastest lap in Friday's first practice for his home British Grand Prix, with Mercedes one-two at the top of the timesheets.
The 33-year-old, who will be chasing his fifth successive Silverstone victory on Sunday and sixth in total at the former World War Two airfield, lapped with a time of one minute 27.487 seconds.
Hamilton's Finnish team mate Valtteri Bottas, with a new engine in his car after last weekend's retirement in Austria, was second fastest but 0.367 off the pace.
The 20-year-old Dutchman ended the session early after he was told to stop the car.
Haas's Romain Grosjean had a heavy crash at the first corner after failing to close the drag reduction system (DRS).
"The car is destroyed," the Frenchman, who was unhurt in the impact, said over the radio. "I'm very, very sorry guys. I think it was the bump. I missed the (DRS) button."
"Magnussen tried to hit me two times - in one and three," Alonso reported over the radio. "Very dangerous."