ock1f and 54north15west spot on with your posts, everyone is entitled to their days off and we have seen more strike action from every other corner of Irish Aviation over a lot less than insufficent staff. You only have to ask the guys and girls in EI to change their lunch times and their out with the picket boards!
I wonder if HighLow would rather our controllers become over-tired, and slightly incompetent due to working conditions than having to spend 2 hrs on a slot delay.