Fortec’s Mikkel Grundtvig led from lights to flag in the reverse grid contest at Oulton Park.
With the grid decided by the inverse of the qualifying result, Grundtvig made a great start and pulled out a comfortable lead on the first lap. He regularly extended the margin, to take the flag nearly six seconds ahead of Douglas Motorsport’s Tommy Smith, who held off a late charge from Arden’s David Morales.
Hillspeed's Nick Gilkes held onto a podium place for much of the race, only to relinquish that to Morales late on, and finished seven tenths clear of Chris Dittmann Racing's Branden Oxley, who pulled off a diving move on Fortec's Zak Taylor on lap seven to steal fifth..
Taylor therefore claimed sixth, a second clear of Hitech GP's Cian Shields, with Max Esterson eighth for Douglas Motorsport.
Carlin's Javier Sagrera was ninth, just two tenths behind the American and made the most progress of the leading drivers with three places gained, while Elite's John Bennett ended his first weekend in single-seaters by completing the top-10.
There was drama though for local man and double race winner Luke Browning, who was eliminated from the race on lap five with front suspension damage after contact at the Hislops chicane.
GB3 Championship, partnered by the BRDC, Oulton Park race three result:
1. Mikkel Grundtvig, Fortec Motorsports, 14 laps
2. Tommy Smith, Douglas Motorsport, +5.841s
3. David Morales, Arden Motorsport, +6.208s
4. Nick Gilkes, Hillspeed, +7.743s
5. Branden Oxley, Chris Dittmann Racing, +8.490s
6. Zak Taylor, Fortec Motorsports, +11.796s
7. Cian Shields, Hitech GP, 12.974s
8. Max Esterson, Douglas Motorsport, +14.221s
9. Javier Sagrera, Carlin, +14.429s
10. John Bennett, Elite Motorsport, +16.817s
11. McKenzy Cresswell, Chris Dittmann Racing, +17.276s
12. James Hedley, Elite Motorsport, +17.611s
13. Callum Voisin, Carlin, +17.990s
14. Roberto Faria, Carlin, +18.188s
15. Joel Granfors, Fortec Motorsports, +18.647s
16. Tom Lebbon, Elite Motorsport, +19.091s
17. Matthew Rees, JHR, +19.652s
18. Bryce Aron, Hitech GP, +20.052s
19. Alex Connor, Arden Motorsport, +20.427s
20. Marcos Flack, Douglas Motorsport, +26.085s
DNF. Luke Browning, Hitech GP