Round 12 – Thruxton, 23rd September 1990, 20 laps
| Pos. | Cl. | # | Driver | Team | Cl. | Car | Grid | Time | FL | Laps | Time | Notes |
| 1. | 1. | 1 | Andy Rouse | Rouse/ICS | A | Ford Sierra RS500 Cosworth | 4. | 1:20.28 | 1:20.91 | 20 | 27:24.98 | |
| 2. | 2. | 3 | Tim Harvey | Rouse/Team Labatt's | A | Ford Sierra RS500 Cosworth | 2. | 1:20.12 | 1:21.43 | 20 | 27:38.85 | |
| 3. | 3. | 11 | Robb Gravett | Trakstar/Ford Credit | A | Ford Sierra RS500 Cosworth | 1. | 1:19.66 | 1:20.83 | 20 | 27:45.51 | |
| 4. | 4. | 15 | Graham Goode | Graham Goode Racing/Listerine | A | Ford Sierra RS500 Cosworth | 3. | 1:20.24 | 1:22.09 | 20 | 27:57.28 | |
| 5. | 1. | 90 | Nettan Lindgren | Nettan Lindgren/Dianetics | B | BMW M3 | 13. | 1:24.11 | 1:23.83 | 20 | 28:21.17 | |
| 6. | 2. | 70 | Markus Oestreich | Vauxhall Dealer Sport/Philips Stereo | B | Vauxhall Cavalier GSi | 17. | 1:23.85 | 1:24.10 | 20 | 28:22.04 | |
| 7. | 3. | 51 | Chris Hodgetts | Rouse Sport/Soans+Rational | B | Ford Sierra Cosworth | 11. | 1:23.80 | 1:23.56 | 20 | 28:29.42 | |
| 8. | 4. | 52 | Ian Forrest | Ecosse Motorsport/Drambuie | B | BMW M3 | 19. | 1:25.10 | 1:25.16 | 19 | | |
| 9. | 5. | 20 | Dave Brodie | Brodie-Brittain Racing | A | Ford Sierra RS500 Cosworth | 7. | 1:21.77 | 1:22.24 | 19 | | |
| 10. | 5. | 55 | Frank Sytner | Prodrive/BMW Finance + Mobil 1 | B | BMW M3 | 9. | 1:23.19 | 1:23.75 | 19 | | |
| 11. | 6. | 99 | Jeff Allam | Vic Lee Motorsport/Auto Audio+Arquati | B | BMW M3 | 16. | 1:23.98 | 1:23.75 | 19 | | |
| 12. | 7. | 77 | Godfrey Hall | Pyramid Motorsport/Gemini Car Alarms | B | BMW M3 | 14. | 1:23.92 | 1:23.94 | 19 | | |
| 13. | 8. | 53 | Chuck Nicholson | Ecosse Motorsport/MF Industrial+FES | B | BMW M3 | 22. | 1:25.53 | 1:26.49 | 19 | | |
| 14. | 9. | 100 | Ray Armes | Trakstar/PG Tags Racing | B | Honda Civic | 24. | 1:27.42 | 1:26.96 | 19 | | |
| 15. | 10. | 88 | David Leslie | Pyramid Motorsport/Gemini Car Alarms | B | BMW M3 | 20. | 1:25.30 | 1:24.17 | 19 | | |
| 16. | 11. | 56 | Kurt Luby | Prodrive/BMW Finance + Mobil 1 | B | BMW M3 | 10. | 1:23.38 | 1:23.59 | 19 | | |
| 17. | 12. | 60 | Mark Hales | John Maguire/Firestone + Hays | B | Mitsubishi Starion | 21. | 1:25.40 | 1:26.25 | 19 | | |
| 18. | 13. | 57 | Nick Baird | Techspeed Motorsport/Wipak | B | BMW 318iS | 23. | 1:25.74 | 1:26.48 | 18 | | |
| DNF | | 10 | Laurence Bristow | Rouse/Team Labatt's | A | Ford Sierra RS500 Cosworth | 5. | 1:20.42 | 1:21.68 | 12 | | Engine |
| DNF | | 50 | John Cleland | Vauxhall Dealer Sport/Philips Stereo | B | Vauxhall Cavalier GSi | 8. | 1:22.62 | 1:23.37 | 12 | | Engine/lap record |
| DNF | | 66 | Nick Whale | Pyramid Motorsport/Mobil Super Plus | B | BMW M3 | 18. | 1:25.79 | 1:24.78 | 10 | | Suspension |
| DNF | | ? | Jeff Wilson | HWR/Bristol Street Motors | B | Vauxhall Belmont | 25. | 1:29.21 | 1:28.54 | 10 | | Clutch |
| DNF | | 69 | Ian Flux | BRR/Advanced Surface Coatings | B | BMW M3 | 15. | 1:23.97 | 1:24.69 | 7 | | Spin |
| DNF | | 4 | Sean Walker | Rouse/FAI Automotive+LuK | A | Ford Sierra RS500 Cosworth | 6. | 1:21.44 | 1:22.14 | 4 | | Overheating |
| DNS | | 22 | Dennis Leech | Dennis Leech/Partservice Exeter | A | Ford Sierra RS500 Cosworth | 12. | | | | | Engine |
Robb Gravett secured the overall title with this result.
Nettan Lindgren won class B. Has any female driver repeated this feat in the variety of privateer cups or +production specification cars that has been part of the BTCC since 1990?
German Markus Oestreich imported from the DTM to drive the second Vauxhall Cavalier. By this point his usual mount was an Irmscher prepared Opel Omega 3.0 24V
Chuck Nicholson returning to the BTCC. His latest previous race was at Oulton Park in early 1987 driving a Chris Hodgetts Corolla.
Jesper