Rodin Motorsport's Abbi Pulling set the quickest time in the third and final practice session of the day at the Circuit de Barcelona-Catalunya, with a lap over half a second clear of the pack.
The British driver set her time of 1m32.756s inside the final 10 minutes of the session, putting her 0.561s clear of JHR's series newcomer Thomas Ingram Hill, who enjoyed his best session of the week, having also topped the times before Pulling's rapid tour.
Championship contender Lucas Fluxa also delivered his best showing of the week with the third quickest time and just 0.025s behind the GB4 graduate.
The Spanish driver set exactly the same lap time as 2025 GB4 champion Ary Bansal, who was fourth fastest by virtue of Fluxa setting the lap time first.
The second Rodin of Martin Molnar was fifth fastest, 0.018s further back and little over half a tenth clear of yet another debutant, Hitech's Theo Palmer.
Kyuho Lee was again the quickest Elite Motorsport runner, one hundredth of a second away from Palmer and 0.034s ahead of Hitech's title challenger Deagen Fairclough.
Fairclough's teammate Yuhao Fu topped the session halfway through and was ninth quickest at the end, five thousandths of a second ahead of JHR's Lewis Wherrell, who was the fourth newcomer within the top-10.
While Pulling enjoyed a half second margin at the top, the remainder of the top-10 was covered by just 0.169s, while VRD's championship leader Nikita Bedrin, who was 14th in FP3, remained the quickest driver of the day courtesy of his 1m32.674s from FP1.
The GB3 field returns to action with the final qualifying session of the year at 10.55 on Saturday morning.
GB3 Championship, partnered by the BRDC, Circuit de Barcelona-Catalunya, Free Practice Three result:
1. Abbi Pulling, Rodin Motorsport, 1m32.756s
2. Thomas Ingram Hill, JHR Developments, +0.561s
3. Lucas Fluxa, Xcel Motorsport, +0.586s
4. Ary Bansal, TJ Speed Motorsports, +0.586s
5. Martin Molnar, Rodin Motorsport, +0.604s
6. Theo Palmer, Hitech, +0.659s
7. Kyuho Lee, Elite Motorsport, +0.670s
8. Deagen Fairclough, Hitech, +0.704s
9. Yuhao Fu, Hitech, +0.725s
10. Lewis Wherrell, JHR Developments, +0.730s
11. Patricio Gonzalez, VRD Racing, +0.801s
12. Dante Vinci, Hillspeed, +0.992s
13. Rowan Campbell-Pilling, Xcel Motorsport, +1.067s
14. Nikita Bedrin, VRD Racing, +1.189s
15. Flynn Jackes, Elite Motorsport, +1.249s
16. Aurelia Nobels, Hillspeed, +1.259s
17. Maxim Rehm, Rodin Motorsport, +1.266s
18. Fred Green, Elite Motorsport, +1.379s
19. Peter Bouzinelos, Hillspeed, +1.498s
20. Ricardo Baptista, Xcel Motorsport, +1.557s
21. Arjen Kraling, TJ Speed Motorsports, +1.567s
22. Rodrigo Gonzalez, VRD Racing, +1.701s
23. Leon Wilson, Arden Motorsport, +1.730s
24. Jason Pribyl, Nitrous Competitions ADM Racing, +2.010s
25. Matan Achituv, Arden Motorsport, +2.251s
Click here for full results.