The final race of the weekend at Silverstone is due to commence at 17.12, with VRD Racing by Arden's Ava Dobson starting from pole.
Race three is the full reverse grid, and with all drivers within 103% of the fastest time in qualifying, series newcomer Dobson therefore starts from pole position.
She completes an all-female front row ahead of Fox Motorsport's Megan Bruce. Elite's Finn Harrison and Fortec's Jack Taylor form row two ahead of Arden's Leon Wilson and Fox Motorsport's Branden Templeton.
Fortec's Dan Hickey carries a five place grid penalty into the race for causing a collision in race two, and starts seventh ahead of KMR's Chloe Grant, who also carries a five place penalty from Snetterton.
KMR's Harry Burgoyne is ninth on the grid ahead of Graham Brunton Racing's Callum Baxter, while Silverstone race winners Lucas Blakeley (KMR) and Linus Granfors (Fortec) complete row six.
Elite's Alisha Palmowski has also picked up a three place penalty for causing a collision in race two, and therefore starts 13th and last in the concluding contest.
GB4 Championship, partnered by the BRDC, Silverstone race three grid:
1. Ava Dobson, VRD Racing
2. Megan Bruce, Fox Motorsport
3. Finn Harrison, Elite Motorsport
4. Jack Taylor, Fortec Motorsport
5. Leon Wilson, Arden Motorsport
6. Branden Templeton, Fox Motorsport
7. Dan Hickey, Fortec Motorsport
8. Chloe Grant, KMR Sport,
9. Harry Burgoyne, KMR Sport
10. Callum Baxter, Graham Brunton Racing
11. Lucas Blakeley, KMR Sport
12. Linus Granfors, Fortec Motorsport
13. Alisha Palmowski