Why Williams picked Sirotkin for 2018 F1 seat

Kubica landed a reserve and development driver role at Williams and there is still hope that he could return to race action in the future.

Ben Anderson and Lawrence Barretto join Edd Straw to explain what the performances of Sirotkin and Kubica in the post-Abu Dhabi Grand Prix Pirelli tyre test told us about the drivers - and what role budget played in the team's decision.

There's also insight into Kubica's ultimate potential, and how much performance he still might be able to unlock with his test and Friday outings for Williams this year.

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