On 28 November 2014, Williams announced that Wolff would stay with the team for the 2015 season in an enhanced role as test driver, with her position expanded to include two Friday practice runs and two test outings. After driving in Formula One pre-season testing, Wolff clocked a 1:29.708 lap in the first practice session of the Spanish Grand Prix and returned to the cockpit in practice for the British Grand Prix, posting a 1:37.242 for a respectable 13th place out of 20 cars.