sick
Yes you can call sick downroute
Though what would be gained in the event of a strike is questionable.
In effect the crew will only be on strike when they return to their home base and possibly only when they are due to operate their next service and chose to strike then.
What is unclear to me though is when the staff travel will be withdrawn in the event of a yes vote and subsequent strike and who it will affect.
Will non strikers/no voters/volunteers be affected?
I predict/guess that many commuters , particularly from europe may well vote yes but continue to work as to loose their staff travel would effectively make their job impossible.