So, at the end of six days of running split between Barcelona and Sakhir, which team looks to have adapted best to the new regulations and who will start the season playing catch up?
Red Bull set the fastest time on the final day of testing in Bahrain, edging Ferrari and Alpine, while Mercedes clocked in fourth-fastest.
At the track, Luke Smith and Matt Kew review the final day of running and consider the possible pecking order.
