Ben Currie extended his championship lead to 39 points as he beat Luke Stapleford in the Sprint race – as rival Rhys Irwin crashed out while running second.
From pole, Currie got a clean and quick getaway at the lights to take the lead and held it all the way to flag, beating Stapleford by 0.433secs, who had moved into second position when Irwin crashed on lap seven.
Tom Booth-Amos finished third, just 0.124secs behind Stapleford as Tom Toparis was fourth and Richard Cooper fifth.
Cameron Fraser took the GP2 class honours as he crossed the line 11th overall with Harry Rowlings taking second in class and Harvey Claridge third.
Quattro Group British Supersport & British GP2 Championships, Sprint race result:
1. Ben Currie (Oxford Products Racing Ducati)
2. Luke Stapleford (Profile Road & Racing Performance) +0.433s
3. Tom Booth Amos (Gearlink Kawasaki) +0.557s
4. Tom Toparis (Macadam Racing) +8.318s
5. Richard Cooper (PHR Performance Triumph) +9.401s