Paul Hembery: "It was a very important session today for all the teams, as they aimed to gather as much information as possible in order to prepare their race strategies, which are going to have a big influence on the final outcome of the race. Barcelona is well known for a notable degree of tyre wear thanks to long and fast corners such as turn three, and although we still have plenty of data to analyse, it seems that the frontrunners will be likely to adopt a three-stop strategy.
"However, with a wider gap between the two nominated tyres than usual - both in terms of compound and performance - we could see some quite different strategies that are capable of springing a surprise. And of course if the rain showers that some people are predicting for Sunday materialise, then the race will take on an entirely new and unexpected complexion. With many of the teams introducing new developments in Spain, it almost feels like we are starting the season from scratch again."