A day of downpours at Silverstone did little to further the cause of the leading contenders in the World Superbike Championship.
Frenchman Loris Baz took his first ever victory in the competition in Race One.
The contest was stopped twice because of crashes, while Race Two was abandoned halfway through, with riders receiving half points.
Championship leader Max Biaggi of Aprilia crashed out of Race One, while of his nearest rivals, BMW’s Marco Melandri was seventh and Tom Sykes of Kawasaki could only manage eighth on home soil.
Michel Fabrizio and Ayrton Badovini took second and third for BMW, with Red Bull athlete Jonathan Rea, of Honda, fourth.
Sylvain Guintoli of Ducati made it a French double in Race Two, with Baz second and Jakub Smrz of Ducati third. Rea finished ninth and Biaggi 11th.
In the Supersport race, world championship leader and Red Bull athlete Kenan Sofuoglu finished fifth for Kawasaki.
The race was won by Honda’s Jules Cluzel, with Sam Lowes second and Broc Parkes third.
The next round takes place at the Moscow Raceway on August 26.