On the timesheets, Repsol Honda Team's Marquez set a lap of 2'02.531 1.7 seconds slower than his pole time and led the way from Yamaha Factory Racing's Jorge Lorenzo and Ducati Team's Nicky Hayden. However, on a cool morning in England, numerous riders were caught out by cold tyres, particularly in left-handed corners.
PBM's Yonny Hernandez was the first to crash, losing control and highsiding at Chapel to mark his third crash of the weekend. Ignite Pramac Racing's Michele Pirro was next and proved to be the first of three riders to crash at Vale; the next was Monster Yamaha Tech3's Cal Crutchlow (also his third crash of the weekend), before Marquez lost control just moments later. Marquez's bike dramatically collided with the stricken machine of Crutchlow, but thankfully both the Silverstone marshals and Crutchlow himself were able to flee the scene in time. Before the session drew to a close there was another incident, as Hayden suffered a lowside at Farm curve.
The crash left Marquez with a dislocated left shoulder, which was put back into place but leaves the championship leader in much pain ahead of this afternoon's race. Elsewhere, Power Electronics Aspar's Aleix Espargaro was declared fit to continue competing, having broken a finger and injured his neck in a Saturday practice crash.
The Hertz British Grand Prix will begin at 1pm local time (GMT +1).