Lewis Jones emerged quickest as the Junior Supersport machines hit the track for the first time this weekend, beating Finn Smart-Weeden by 0.167s with a lap of 1min 45.252s.
Joe Ellis ended the session in third place, just ahead of Jack Smith as Jacob Stephenson rounded out the top five.
HEL Performance British Junior Supersport Championship with Motocourse, free practice:
1. Lewis Jones (Symcirrus Motorsport) 1min 45.252s
2. Finn Smart-Weeden (Wrapped Racing by Club 74) +0.167s
3. Joe Ellis (JPR) 0.586s
4. Jack Smith (Woodland Kawasaki) +0.838s
5. Jacob Stephenson (Kevin Stephenson) +0.911s