BetterByBoat
We do not hold contrary views. You are right, BA can sack who they want, when they want. But for it to be fair, due process has to be followed. Taking unprotected action would lead to a gross misconduct dismissal, but if due process was not followed, it may not be a fair dismissal and then potentially very expensive.
Going on strike and the sanctions around it are based in civil law and are statutory inventions and would be seen as unlawful, not illegal.