Kimi Raikkonen says the Ferrari team must analyse what caused him to struggle during second free practice at Silverstone having made a positive start to the British Grand Prix weekend in FP1.

The Finn, who is under increasing pressure to perform relative to team-mate Fernando Alonso having now slumped to 12th in the overall standings, began the day relatively well with the fifth fastest time in first free practice.

However, changes to the Ferrari's settings at the start of FP2 did not have the desired effect, prompting him to revert to the morning settings. With that return also failing to improve competitiveness, Raikkonen would end the day in ninth place and scratching his head as to why he wasn't as fast.

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"This morning in the first session things went reasonably well. We followed the standard programme, including analysing car behaviour on the hard tyres and we just had a few problems with traction at some points on the track and a bit of understeer in the high speed corners.

"In the second session, we made some small changes which did not work and the handling of the car was not the same. Putting a good lap together was really difficult and so we went back to the morning settings, but unfortunately we had the same problems.

"Now we must find out what happened between the two sessions, even if I think it's partly down to the track conditions and the gusts of wind, which were very strong today. I'm sure that studying the data will give us the information we need to prepare as well as possible for tomorrow."

The Finn, who won the 2007 F1 World Championship, took to the track today having suggested he would retire at the end of the 2015 season in the British Grand Prix pre-event press conference.