If AMS crews strike then that's wholly at their discretion.
What you morons calling crews 'scabs' need to realise is that under UK law refusing to crew a flight on the grounds that it's to cover industrial action is illegal and will lead to your instant dismissal.
As much as I respect and sympathise with the strikers, my mortgage and the wellbeing of my family, bank balance and career prospects are much more important to me. If I'm assigned an AMS flight that would have been cancelled, then I'm on it wether I like it or not.
The problem in the UK is worsened by the fact that the industry is small here in the UK. What you jolly foreigners don't realise is that airlines in the UK are managed by old RAF squadrons who remain friends and will pass your name round quicker than you could don a pair of clogs. Bang goes your career in the UK. Why the hell should I be banished to the sand pit or dodgy contract work just for the sake of AMS base striking????
Look what happens when you leave a UK airline even on good terms. It's a one way system and in most cases you're black listed. The construction industry here was recently pulled for such actions. The aviation industry still practices it however.