Jack Dunabie picked up where he left off a fortnight ago as he stormed to the top of the FP1 timesheets, beating points leader Ryan Frost by 0.434secs.
After a double win at Snetterton, Dunabie topped the first practice session with a best lap of 1min 36.115secs.
Frost was second at the flag, with Geoge Bowes third, Jack Burrows fourth and Harrison Day fifth.
R&G Moto4 British Cup, FP1 result:
1. Jack Dunabie (Kovara Projects/RS Racing) 1min 36.115s
2. Ryan Frost (Fibre Tec Honda by MLav Racing) +0.434s
3. George Bowes (A Edwards Racing) +0.626s
4. Jack Burrows (Burrows Engineering/RK Racing) +0.814s
5. Harrison Day (LRA Moto supported by HV Solutions) +0.868s