Andy Priaulx set the quickest time in class, 1:56.233 at the wheel of the #67 Ford GT. The Briton shared the car with Harry Tincknell and Pipo Derani.
The sister #66 Ford GT driven by Olivier Pla, Stefan Mucke and Billy Johnson was second fastest in GTE-Pro.
Ferrari bounced back in this session as the two AF Corse-run 488 GTEs were third and fourth, the #51 Ferrari ahead of the #71 machine.
The Porsche GT Team #91 Porsche 911 RSR was fifth. The two works Aston Martin Racing Vantages were sixth (#97) and seventh (#95). The The Porsche GT Team #92 Porsche 911 RSR was eighth.
In the GTE-Am , the #98 Aston Martin Vantage GTE driven by Paul Dalla Lana, Mathias Lauda and Pedro Lamy was the fastest in class ahead of the #61 Ferrari 488 GTE from Clearwater Racing.
The qualifying session for the 6 Hours of Silverstone will get underway at 13:00.