Since BASSA/Unite is not able to give any alternatives to the cost cutting measures already in place (A.Lurker has been ignoring question to that effect for days now for instance) I see why BA sees no point to negotiations. There is no point if the other party has no alternative that really helps.
So by forcing the issue BA can actually increase their savings if CC go on strike. I think they would want that scenario. Sack enough of the more expensive people and take that hit. Take the loss of revenue. Each will be around GBP 50M. For this they also get rid of their most expensive old timers who are adverse to change. It also helps with the pension fund problem.
I would have no hesitation in breaking the law, paying up and smiling all the way to the bank if I was WW.