76Fan - the AH1 Gazelle for AAC use didn't have SAS fitted although the ones for 3BAS (as was) did. The RAF and RN ones HT2/3 did have SAS fitted.
Many of us believe the SAS in the yaw channel was one of the problems as the series actuator could move the pitch of the blades without corresponding pedal movement until it ran out of authority. When that happened, the actual pedal position was often not where it needed to be and as the yaw started, the first application of pedal seemed to have little effect - this was why pilots thought they had a yaw control problem when in fact they just didn't have enough right pedal in.