Standard hours apply by default and need no accreditation. Basic Fatigue Management (BFM) and Advanced Fatigue Management (AFM) allow more flexible hours in exchange for NHVAS accreditation and stronger systems, records and audits.
Fatigue applies to vehicles over 12 tonnes GVM (and buses over 4.5 tonnes with more than 12 seats). Whatever the level, the operator must be able to show work and rest records and that breaches are picked up and acted on. The fatigue and work diaries guide covers the practical duties.
General information, not tax or legal advice.