Max Cook ended day one at Donington Park on top as he beat Franco Bourne to the quickest time of the day with a 1m:10.072 lap of the Donington Park National circuit.
Bourne, who had been fastest in FP1, saw off a challenge from Aaron Silvester who ended the day third, with Seth Crump fourth and Sam Laffins fifth.
Pirelli National Junior Superstock Championship with MotoNovo Finance, Donington Park, Combined Practice:
1. Max Cook, Uggly & Co by Binch Racing
2. Franco Bourne, Marvel HCL Motorspot +0.030s
3. Aaron Silvester, A&J Racing +0.196s
4. Seth Crump, Seeeeeth +0.254s
5. Sam Laffins, Cheshire Mouldings Kawasaki by JR Performance +0.372s