Can't help but chuckle every time someone says that the guys down south must experience more icing. Started my career Sth Island NZ and slowly moved north, and the icing is definitely worse the further north I go. The air tends to simply hold less moisture due to the colder temps down south.
As far as "known or forecast icing" conditions go, I'd be interested to know what the legal take is on scattered cloud at the cruising level in sub zero temps. It certainly never caused any grief over bass straight.