Williams face a busy night evaluating the performance of a number of updates after a truncated start to the British Grand Prix weekend at Silverstone.
With the opening practice session being a virtual wash-out after rain led to just eleven drivers setting a time, teams were forced to try and complete their planned programmes in the drier second session of the day.
Thanks to the time lost, Williams elected to split its workload across its two cars with Valtteri Bottas and Pastor Maldonado running different programmes to enable to the team to collect as much data as possible for the remainder of the weekend.
The team will now use the data secured to make a decision on which way to go for final practice on Saturday morning, where both cars will run in the same configuration.
“It was raining this morning so we could only run on full wet tyres in FP1 to get a feel for the balance of the car,” technical director Mike Coughlan said. “Our test programme was therefore shifted to FP2, so we didn't run the prototype tyre as we needed time to get through all the changes we had planned.
“Pastor was doing mechanical tests, whilst Valtteri did aero evaluations with two different packages we have here. We gathered all the information we needed so now we will analyse the data to decide which direction to go. Both cars will run with the same configuration tomorrow.”
Both Maldonado and Bottas admitted it had been far from ideal on track, with Bottas also taking time to show support for the fans who had braved the conditions for little return in the opening session.
“Conditions were not ideal today, especially as we were trying to test new parts on the car,” the Finn said. “It's the same for all teams, but I really feel for the fans as they didn't see much running.
“We managed to test with both the prime and option tyres in the second practice session, so we'll look at the data tonight and assess where we need to improve for the final practice session and qualifying tomorrow.”