Crab,
The whole 24 hr duty counts to the WTD regardless of whether the crew are called out at night or not, so any increased night flying would have no effect on their duty hours.
I have no idea what is portrayed on the RCS or why, since I have no access to it.
IFR minima was a bit misleading, I didn't mean diversion fuel - min landing fuel plus some for holding/positioning for IFR approach.
So the S92 is in the same ball park as the Sea King for RoA, but it will get there much quicker.....
Regards,
Calli