Wessex HAS1 AFCS comprised MK19 Autopilot and Hover Coupler. (built by Louis Newmark of Watch fame)
Autopilot autostab Gyros in Pitch/Roll with Heading and Bar Alt locks, Bar Alt was set at safe height before transition.
Transition controlled by Hover Coupler with Rad Alt and Doppler inputs until Hover point, when ball lowered, and control switched to cable sensors
No duplex channels.
737 Squadron FCS specialist 62/63 and occasional LH set occupant