Hill whisked his West Surrey Racing-run BMW 330e M Sport around the short Scottish circuit 0.169 seconds quicker than the closest opposition during the slightly less wet second session.
The Kentishman, who lies fourth in the championship, completed two laps quicker than the best set by anybody else, with the Excelr8 Motorsport Hyundai i30 N of reigning champion Tom Ingram his closest challenger.
Third fastest was the One Motorsport Honda Civic Type R of Josh Cook, who spent much of the opening session at the top of the times.
Cook then triggered the first of three red flags in FP1 when he lightly nudged the tyre wall at the hairpin and although he did get back on track following the restart, his fastest time was eclipsed by the Speedworks Motorsport Toyota Corolla of Ricky Collard to the tune of 0.069s. Hill ended up third in FP1.
Times were approximately a second quicker in FP2, and it was Dan Cammish who finished the session in fourth spot in the quickest of the Motorbase Performance-run Ford Focus STs, which this weekend are sporting a tartan version of their NAPA Racing livery to raise awareness for Jackie Stewart’s Race Against Dementia charity.
Cammish narrowly edged out team-mate and championship leader Ash Sutton, who survived a spin at the hairpin during the first session.
Source: Autosport