Mercedes driver Nico Rosberg bounced back from early gearbox woes to post the quickest time during the opening practice session for the British Grand Prix.
Rosberg led the preliminary stages of running but had to stop his W06 Hybrid on track due to a hydraulic fault in his gearbox, after which team-mate Lewis Hamilton moved to the front, having survived an early spin exiting Stowe.
Hamilton looked set to stay quickest but Rosberg returned to the track during the final 10 minutes and went 0.01s quicker at the front, before improving his own time by a further 0.06s, to sit 0.07s faster with a 1:34.274.
Toro Rosso enjoyed a promising start to its weekend as Max Verstappen was third quickest in the STR10, ahead of team-mate Carlos Sainz Jr, albeit over a second behind the dominant Mercedes duo.
Kimi Räikkönen was fifth quickest despite temporary MGU-K problems while Sebastian Vettel moved into sixth place during the closing stages of the session.
Daniel Ricciardo was seventh fastest for Red Bull, pursued by team-mate Daniil Kvyat and Force India’s Nico Hülkenberg, as the local squad unveiled its update package, which included ‘nostrils’ on the nose cone of the VJM08.
Felipe Massa completed the top 10 for Williams, ahead of Felipe Nasr - who had a spin under braking for Village - and Sergio Pérez.
Susie Wolff received her second practice outing of the season with Williams and she was 13th fastest, ahead of fellow Friday drivers Jolyon Palmer (Lotus) and Raffaele Marciello (Sauber).
Pastor Maldonado was 16th for Lotus while McLaren remained in the garage for much of the session, leaving Fernando Alonso and Jenson Button in 17th and 18th places respectively.
Manor Marussia debuted its revised livery with Will Stevens ending two-tenths behind Button and significantly ahead of Roberto Merhi.