Hitech's Deagen Fairclough topped the times as the GB3 Championship field completed a pre-event test day on the Brands Hatch Indy Circuit ahead of this weekend's penultimate event of the year on the Grand Prix layout.
The British driver, who has won four of the last six races, set a 41.287s lap in the first of the day's four sessions, putting him just 0.016s ahead of VRD Racing's championship leader Nikita Bedrin.
Rodin's Abbi Pulling was next up, 0.084s behind, and 0.019s ahead of Xcel's Rowan Campbell-Pilling, who topped the final session, but like the majority of the top-10, set his best time in the first test.
VRD's Patricio Gonzalez was eight thousandths of a second behind in fifth, and 0.015s clear of Hillspeed's Dante Vinci.
Elite's Flynn Jackes was 0.040s further back to complete a top-seven covered by less than two tenths of a second.
Xcel's Lucas Fluxa was the only contender in the top-10 not to set their best time in the first test, with his final session lap enough to put him eighth overall.
Hitech's series returnee Kanato Le was within a quarter of a second of the pace in ninth, and 0.138s ahead of Rodin's Maxim Rehm, who completed the top-10.
GB3 action switches to the Grand Prix circuit for the rest of the event, with practice at 9am ahead of the double qualifying session at 11am.
GB3 Championship, partnered by the BRDC, Brands Hatch Indy Circuit, Friday combined testing result:
1. Deagen Fairclough, Hitech, 41.287s
2. Nikita Bedrin, VRD Racing, +0.016s
3. Abbi Pulling, Rodin Motorsport, +0.100s
4. Rowan Campbell-Pilling, Xcel Motorsport, +0.119s
5. Patricio Gonzalez, VRD Racing, +0.127s
6. Dante Vinci, Hillspeed, +0.142s
7. Flynn Jackes, Elite Motorsport, +0.182s
8. Lucas Fluxa, Xcel Motorsport, +0.227s
9. Kanato Le, Hitech, +0.248s
10. Maxim Rehm, Rodin Motorsport, +0.386s
Click here for full results.