Silly question wrt race regs

[WilliamS]

What motor regulations are in effect for 4wd at Stotfold? Brushless spec, brushless modified? Any turn limit?

The series information page just says "Racing to BRCA rules" which don't define this. They say that each region chooses what motors are to be run, etc. Hence my confusion

(However it is too late really, I have bought myself a motor and ESC combo, I just want to check it's legal while I can still return it (for swap) to DMS for just the postage fee if needed. Whoops!)