Cheers Stam, that confirms my thinking. Looking at a previous forum post on this the poster followed this, is that correct:
N2" to Terminal N on Hive
"L2" to Terminal L on Hive
"HWl" to Terminal 1 Hot Water Off (NC) on Hive
"HWr" to Terminal 3 Hot Water On (NO) on Hive
"CHl" to Terminal 2...