Jack Kennedy will once again start from pole after beating Harry Truelove by more than half a second.
The Mar-Train Racing rider’s best lap of 1min 28.628sec was 0.711sec quicker than Truelove, who in turn, beat his Appleyard Macadam Racing team-mate Bradley Perie by 0.143s.
Rhys Irwin will head the second row with his best qualifying in the series to date, just ahead of Jack Scott, who will start from fifth as top GP2 runner.
In the GP2 battle, it was Cameron Fraser who emerged second quickest and will start 14th overall with Barry Burrell third fastest in 17th spot.
Quattro Group British Supersport & British GP2 Championship, Cadwell Park, Qualifying:
1. Jack Kennedy (Mar-Train Racing) 1min 28.628s
2. Harry Truelove (Appleyard Macadam Racing) +0.711s
3. Bradley Perie (Appleyard Macadam Racing) +0.854s
4. Rhys Irwin (Astro JJR-Triumph) +1.308s
5. Jack Scott (Kovara Projects/RS Racing) +1.320s