Billy McConnell stayed on top during the second session of the day to lead the way with a best lap of 1m:36.139s, 0.477s ahead of Joe Francis.
Charlie Nesbitt came through to end the day an impressive third quickest, just ahead of Davey Todd as Alex Olsen ended the day fifth.
Pirelli National Superstock Championship with MotoNovo Finance, Oulton Park, combined practice:
1. Billy McConnell (C&L Fairburn Properties/Jackson Racing)
2. Joe Francis (Stauff Fluid Power Kawasaki) +0.477s
3. Charlie Nesbitt (VisionTrack Suzuki) +0.681s
4. Davey Todd (Milenco by Padgetts Motorcycles ) +0.749
5. Alex Olsen (FHO Racing with Kobelco) +0.757s