Not Icing
It was more than just icing, they hated it. I didn't like doing CC either as we all want to do the best job we can, but there comes a point where you just can't have the piss taken anymore.
Working G days etc just negates some of the pressure put on by lack of crew.
You don't have to do much really, just play by the book. When they phone, and if they catch you, then say as little as possible, "sorry cannot work that day" is all they need to know. When you get into long explanations that is when you start to dig a hole.