Hi, so I can confirm.... after putting the wire into port 4 I now have CH control from the Hive. But HW control is from the Hortsmann. Therfore to go fully Hive I do the following: Put the Hortsmann L/N/E in with the R6660D wiring into the Hive. Then the switch live for CH that was in the R6660D keep in port 4. But the switch live that was in the Hortsmann for the HW I put into port 3. Then voila I should have full control from my dual Hive?
