if you can decipher
http://www.brca.org/Sections/off_e_10/Racing/2009%2010th%20offroad%20rules.pdf the 2009 BRCA Rules, which say something about an F5 being a licence awarded to any competent driver by and at the discretion of BRCA local clubs and F1 - F4 being based on percentage of drivers of the previous year, perhaps you can explain to the rest of us?