Once you hold a code C1, C, C1E or CE driving licence, what extra authorisation must be endorsed on it before you may use the vehicle to convey goods, passengers for reward, or dangerous goods?

1. Nothing further; the heavy code alone is enough
2. A professional authorisation, in category G, P or D as applicable
3. A second learner's licence for the same code
4. A roadworthy certificate for the vehicle only