Reigning World Champion Lewis Hamilton stayed on top during the second practice session at Silverstone as Mercedes team-mate Nico Rosberg hit trouble.
The pair were separated by just 0.033s during the opening session on Friday but Rosberg suffered a water leak which Mercedes appeared to resolve half an hour into running.
Rosberg was set to join the action but Mercedes then conducted further investigations, ruling him out of the entire session.
It left Hamilton clear to finish at the top of the standings, with a 1:31.660, 0.391s clear of Red Bull’s Daniel Ricciardo, with Max Verstappen in third position.
Ferrari placed fourth and fifth, with Sebastian Vettel in front of Kimi Räikkönen, as Fernando Alonso gathered sixth place for McLaren.
Valtteri Bottas and Romain Grosjean were the only other drivers to lap within two seconds of Hamilton’s best, finishing the day in seventh and eighth respectively.
Jenson Button reported “strange power” from his McLaren but hauled himself up to ninth while Felipe Massa completed the top 10 for Williams.
Carlos Sainz Jr. placed 11th as Esteban Gutiérrez returned to the Haas VF-16 after handing over duties to youngster Charles Leclerc earlier on Friday and classified 12th.
Daniil Kvyat damaged his front wing by spinning at Club en-route to 13th spot, ahead of Sauber’s Felipe Nasr and Force India pair Nico Hülkenberg and Sergio Pérez.
Pascal Wehrlein built on his recent good form by taking 17th position for Manor, ahead of Jolyon Palmer, Marcus Ericsson, Kevin Magnussen and Rio Haryanto, with the Indonesian almost a second down on his nearest rival.