Eddy, I'd say that your comments about the crapper are unnecessary. I didn't strike but I accept the right to strike as being fundamental and I believe that strikes are legally protected whilst acting within the law. That protection runs for anywhere between 2500 to 6000 cabin crew who striked.
As for the few who are seriously militant, well yeah, it might be illegal to sack them but not impossible. After all, its illegal to drive at 40mph in a 30mph zone but people do it and when court pay the fine. Thing is they still drove at 40mph, that cannot be changed.
If Walsh really wants to resolve this dispute though, I'd suggest that sacking strikers would only escalate the bitterness and cause further action. He is a thing. BA is so big I feel that at times the CEO must be a politician as well as a businessman, sell change, inspire staff.