Rhys Irwin powered to his first ever Supersport win as he took victory for the Astro-JJR Suzuki squad.
Irwin – who has been in the top five for most of the weekend – hit the front early in the 20-lap race and despite a late charge from Stapleford, took the win by 0.076secs.
Ben Currie crossed the line third, just ahead of Tom Toparis as Eugene McManus took fifth.
In GP2, Joe Collier bounced back from his race one crash to take the class win, with Cameron Fraser second and Harry Rowlings third.
Quattro Group British Supersport & British GP2 Championship, Feature race result:
1. Rhys Irwin (Astro-JJR Suzuki)
2. Luke Stapleford (Profile Road & Race Performance) +0.076s
3. Ben Currie (Oxford Products Racing Ducati) +3.498s
4. Tom Toparis (Macadam Racing) +6.995s
5. Eugene McManus (Completely Motorbikes Triumph) +7.029s