Ah, that's it -- I remember now. Basically you're free to go on strike unless you have agreed not to. If you do, it will simply be treated as a breach of the ag

Ah, that's it -- I remember now. Basically you're free to go on strike unless you have agreed not to. If you do, it will simply be treated as a breach of the agreement and the other party will be able to sue for damages. So yeah, strikes are perfectly legal.