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Daniil Kvyat set the fastest time on the morning of the second day of testing at Silverstone as Lewis Hamilton completed just five laps due to a spin.
Taking over from Jean-Eric Vergne, Kvyat completed 28 laps in the first four hours of the day and set a best time of 1:35.544 on the soft tyres, leaving him just over 0.3s off the fastest time set by Felipe Massa on the opening day. However, Kvyat did cause a red flag shorty after midday when he stopped in the final sector.
Of the four stoppages in the morning, Hamilton's was the most dramatic as he spun off at Stowe on his fifth lap having been carrying out aerodynamic tests. Mercedes confirmed it was just a case of a spin on cold tyres, but having gone off just over an hour in to the day Hamilton was yet to re-emerge at 1300 local time.
Kevin Magnussen was second quickest for McLaren as he completed 44 laps during the morning, setting a best time just under a second slower than Kvyat having started the day conducting constant speed aero tests.
Ferrari had Jules Bianchi driving in place of Kimi Raikkonen following the Finn's heavy crash at the start of Sunday's British Grand Prix and Bianchi was third quickest with a 1:37.195. It promises to be a more productive day for the team as well as Bianchi is only seven laps shy of Pedro de la Rosa's total from Tuesday after a water leak curtailed Ferrari's running yesterday.
With Bianchi having driven for Marussia on Tuesday, Max Chilton took over duties on Wednesday and set the fourth fastest time just 0.164s behind his team-mate after 39 laps. Dani Juncadella was fifth in the Force India but over two seconds off the pace, but still 0.3s ahead of Valtteri Bottas for Williams.
Giedo van der Garde was the most productive driver on the second morning as he completed 54 laps, while Sebastian Vettel managed 37 laps for Red Bull but was lapping below the car's true pace as he set a best time of 1:39.915.
Lotus demonstrated Pirelli's 18-inch concept tyres and managed 14 laps on the larger wheels, although Charles Pic was over nine seconds slower than Kvyat's best time. Aside from Hamilton, Julian Leal also failed to set a time for Caterham as the team discovered a CU-H failure which required lengthy work to replace.