Evan Belford drew first blood as the R&G British Talent Cup machines returned to action with a hot lap of 1min 49.452s.
The championship leader put himself 0.135secs clear of second fastest Ollie Walker, with Sullivan Mounsey third.
Fourth quickest was Harrison Dessoy, with Rhys Stephenson fifth as Belford’s main championship rival, Amanuel Brinton, ended the session 10th.
R&G British Talent Cup, FP1 result:
1. Evan Belford (City Lifting/ RS Racing) 1min 49.452s
2. Ollie Walker (VisionTrack Racing Team) +0.135s
3. Sullivan Mounsey (Wilson Racing/Maddison Media) +0.285s
4. Harrison Dessoy (Microlise Cresswell Racing/Easter Garage Racing) +0.361s
5. Rhys Stephenson (Rocket Racing) +0.577s