I think you have misunderstood EpsilonVaz's post.
I work on a UK Contract. If BALPA vote on a strike in accordance with UK law, i would down tools and stand on the picket line without hesitation.
If a pilot on a Portuguese contract decides to strike, I, as stated clearly by others before me, have no mandate to join in that strike action as my union has not had a ballot on strike action and therefore I cannot go on strike under my UK contract.
Therefore, If my company call me out on Dec 23rd to go LIS to operate a flight on the 24th and night stop, I have no option but to comply with their instructions as this dispute is in a different country. If this situation were reversed, however, I would find it very hard to endorse the action as I know that the only people to be absolutely screwed over would be my colleagues.
What epsilonVaz is stating is that if I was called out to operate and therefore miss Christmas day with my children, EpsilonVaz would be willing to operate instead of me and therefore their actions are absolutely to be commended as I would not have another legal option.
Anybody who can not see the obstacles that crews based in another country on a different contract face does not have anything to contribute to this discussion
BTW I am on days off over XMAS for the first time in 5 years so this does not affect me directly but I am concerned for those crews that are on SBY!!