Well spotted GMS! I checked, and it does indeed say that. I will make sure I keep that lovely little document well and truly safe. I've had the policy almost a year, well before any talk of strikes... at least this time around.
Just how my employer would react if I didn't turn up for work, is another matter of course.
Fingers crossed it doesn't even come to this and both sides come to their senses.
Thank you for pointing out that sentence.