The IET/CEF webinar on BS7671A2 a few days ago was a good entertaining, production which was easily digested. At one stage Darren turns to Mark and suggests that we are waiting with bated breath as to whether Mark in consultation with colleagues from ESF will prescribe a code two or three to the absence of AFDDs in an installation. Their decision will then be published in a new Best Practice Guide for periodic inspection and testing. 
I trust that the Guide will keep to domestic installations. Straying into areas where BS7671 mandates AFDDs will cause serious issues with the statutory requirements attendant with those installations. The absence of such devices in these circumstances is best left to professional fire risk assessment rather than some arbitrary declaration that does not have knowledge of the individual premises or the control measures that are in place.