Sergio Perez: "I think we've made a lot of progress throughout the day. We have some good information and we have learned about the new parts on the car; we have made a step forward. The balance is still not ideal so there is the potential to find more performance tomorrow. The track was very green this morning, but it improved this afternoon even though it was very windy."

Esteban Ocon: "It was a solid day and a big effort by the team to try so many different things on the car in the first session. We managed to complete most of the big jobs and now we need to do more homework to understand everything. I think there is still a lot more to come because we are not exactly where we want to be with the car. Track conditions were not easy for anybody because it was very windy and difficult to put together a clean lap and stay on the track."

Otmar Szafnauer: "It's been a productive start to our weekend, despite some tricky conditions. Our work today was mostly aimed at evaluating new aero parts - floor, barge boards and front wing - as well as gathering data about the tyre compounds. The wind was reasonably high and it caught a few drivers out but we managed to collect all the critical data we needed to help our preparations for the weekend. There was a small problem with Sergio's left front wheel at the end of the session, the cause of which we are investigating, but it only cost us a minimal amount of track time. We are in pretty good shape ahead of the weekend with plenty of data to analyse tonight so that the team can make the right decisions for qualifying and the race."

Check out our Friday gallery from Barcelona, here.