Daniel Ricciardo was the fastest driver on the second day of testing at Silverstone after recording a time of 1:32.972 on Thursday afternoon.
The time was recorded while driving for Toro Rosso. Ricciardo also recorded the third fastest time of the day, while driving the Red Bull machine.
His time in the Red Bull was about two tenths of a second slower than the one recorded in the Toro Rosso, despite several runs in the vehicle.
It wasn't all smooth sailing for the Australian, who also ran off the track at Luffield earlier in the day.
Carlos Sainz Jr. had a good day on the track after he finished second, also in the Toro Rosso. It was his first outing in a Formula One car.
Behind the Red Bull and Toro Rosso drivers, Davide Valsecchi completed a programme of aerodynamic and tyre evaluation work to set the fourth fastest time, as he completed his first full day of testing for Lotus.
He too encountered some trouble during his session, after his radio hadn't worked for several laps, which he completed without noticing that the team pit board had requested that he return to the garage.
The consequences might not have been severe but it did provide some amusement for some. This resulted in more and more desperate measures from the pit wall to get him to abort his running - until eventually an extra large makeshift 'IN' sign was finally noticed.
Oliver Turvey continued McLaren's testing programme with the fifth fastest time, while James Calado was sixth overall as he continued to learn about the Force India and help push on with the Silverstone-based team's development work.
Antonio Felix da Costa's secured seventh position overall, ahead of Davide Rigon in the Ferrari and Pastor Maldonado in the Williams. Nico Hulkenberg completed an afternoon of tyre work for Sauber in a bid to get a better indication of the impact the new 2012 construction Pirellis will have on his team's performance.
The German was 10th fastest overall with a best lap of 1m34.224s.
Will Stevens completed his first day of testing in an F1 car with the 13th fastest time for Caterham. As well as Ricciardo's red flag, there were two other session stoppages. Robin Frijns ran off the track at Luffield just before midday during his morning of running for Sauber, while action was suspended an hour later due to debris on track.
1. Daniel Ricciardo Toro Rosso 1:32.972
2 Carlos Sainz Jr. Toro Rosso 1:33.016
3 Daniel Ricciardo Red Bull 1:33.187
4 Davide Valsecchi Lotus 1:33.554
5 Oliver Turvey McLaren 1:33.864
6 James Calado Force India 1:33.957
7 Antonio Felix da Costa Red Bull 1:33.958
8 Davide Rigon Ferrari 1:34.053
9 Pastor Maldonado Williams 1:34.116
10 Nico Hulkenberg Sauber 1:34.224
11 Daniel Juncadella Williams 1:34.631
12 Robin Frijns Sauber 1:34.731
13 Will Stevens Caterham 1:36.082
14 Paul di Resta Force India 1:36.356
15 Rodolfo Gonzalez Marussia 1:37.949
Ricciardo's Big Day Out & More