Silverstone, England - Red Bull's Pierre Gasly was surprise fastest in first British Grand Prix practice on Friday with home favourite and championship leader Lewis Hamilton only fourth on the timesheets.
On an overcast and changeable morning at Silverstone, with a light sprinkling of rain during the latter part of the session, the French driver set a fastest lap of one minute 27.173 seconds, 0.456 quicker than Mercedes's Valtteri Bottas.
Bottas was fastest for much of the session, however, until Gasly's late effort when the conditions improved and the drizzle ended.
Red Bull's Max Verstappen, winner in Austria at the end of June in a race that ended Mercedes' run of 10 successive wins, was third with five times Formula One world champion Hamilton nearly a second off Gasly's pace.
Hamilton has won four of the last five British Grands Prix and is chasing a fifth successive pole position in his home race.