Lance Stroll: "I feel that we have made some progress today. The car is feeling better than it has at the previous races so that's a positive. Unfortunately I put a wheel on the grass in the morning session at the entry of turn nine. We missed a bit of running in the afternoon as a result, but the team did a great job to get the car repaired and we still got our programme done. We have some parts being delivered tonight so we should be in good shape for the rest of the weekend. My feelings on the updates were generally positive, but let's wait and see what the data says."

Sergio Perez: "It was quite a tricky day and difficult to know how we will perform for the rest of the weekend. We completed lots of laps and collected the data, but we are not yet happy with the performance so we need to understand where we can unlock more potential tonight. We were a bit up and down today - at times we seemed more competitive and then at other times we seemed further away. So the work we will do over the coming hours - looking through the data - will be really important to get us in better shape for qualifying. It's early days to give a definite decision on the new parts we tried today and we need more time to really understand them."

Otmar Szafnauer: "We worked through a big job list today and learned a lot about some of the new developments we introduced here in Spain. On the whole I would say we need a bit more time to optimise things. In terms of mileage and data, we ticked the boxes and have enough information to guide our decision making tonight. I'm confident we can find some steps forward to improve for tomorrow. Some of the new parts on Lance's car were damaged at the end of this morning's session, but we are working hard to get everything back to the new spec for tomorrow."

Check out our Friday gallery from Barcelona, here.