Someone (think it was @EFLImpudence ) posted a useful link to updated guidance from the government - basically any defects coded C3 on an EICR on a rental property would not constitute a fail. For sure there'll be plenty of chancers who, when booked to conduct a landlord EICR will walk in and before doing any paperwork will give it the sucking through teeth 'this'll need replacing straight away' - kind of fair comment if 'it' is a 6 way Wylex with rewirable fuses and not an RCD in sight but not really acceptable on a this century plastic box with dual RCD or RCBOs everywhere. Only saving grace is the chancers can't legitimately recycle any perfectly servicable plastic boxes they pull out.
EDIT If you as a landlord encounter one of these then escort them from the premises and grass them up to whoever granted them self-certification rights
EDIT If you as a landlord encounter one of these then escort them from the premises and grass them up to whoever granted them self-certification rights