Jaimie van Sikkelerus took the Sprint win from Tom Toparis as early leaders Ben Currie and Tom Booth-Amos both crashed out from the front.
Polesitter Tom Booth-Amos had been leading by more than two seconds when he crashed on lap seven, handing the lead to Currie who by looked to have sealed the deal as he started the last lap with more than three seconds in hand.
But more drama followed as he crashed moments later, handing the lead to Dutchman van Sikkelerus, who took victory by 1.131s over Toparis.
Luke Stapleford finished third, with Jamie Perrin fourth and Seth Crump fifth.
Joe Collier was eighth overall and took GP2 honours, with Cameron Fraser second and
Quattro Group British Supersport and GP2 Championships, Sprint result:
1. Jaimie van Sikkelerus (MPM Routz Racing Team)
2. Tom Toparis (Macadam Racing) +1.131s
3. Luke Stapleford (Profile Road & Racing Performance) +3.907s
4. Jamie Perrin (Astro-JJR Suzuki) +6.196s
5. Seth Crump (Seeeeeth) +9.284s