Tom Booth-Amos took the win by just 0.066secs over Richard Cooper in a dramatic and delayed Supersport sprint race.
After a massive downpour as the bikes prepared to head to the grid, the race was delayed for almost an hour to allow the worst to pass.
Booth-Amos emerged victorious after taking the lead from polesitter Ben Currie on lap two and after a mistake from Currie a few laps later, Cooper moved up to second, closing up on Booth-Amos’s Gearlink Kawasaki on the last lap but was unable to find a way past.
Luke Jones was third on the Highsparks Ducati, ahead of Eunan McGlinchy fourth and Rhys Irwin fifth.
Joe Collier was lead GP2 runner, finishing ninth overall with Harry Rowlings second and Cameron Fraser third.
Quattro Group British Supersport & British GP2 Championships, Sprint result:
1. Tom Booth-Amos (Gearlink Kawasaki)
2. Richard Cooper (Russell Racing) +0.066s
3. Luke Jones (Highsparks Ducati) +10.658
4. Eunan McGlinchey (Team Val-Tech Racing) +13.066s
5. Rhys Irwin (Astro-JJR Suzuki) +13.836s