Miss M, IIRC most of the price fines (fuel surcharges) pre-date Willie Walsh, going back to 2004. The cost of this BASSA debacle/circus will be far more than a day or so of T5 chaos, which granted does ultimately sit at WW's door (worth pointing out now runs fabulously and most efficient/customer friendly at LHR).
However, the long term upside of ridding the airline of such a scargill-ite, horrid and vindictive parasite union that has no respect whatsoever for customers (being one of those terribly affected by your snow tantrum at Prestwick in Feb) is huge and will be applauded by customers and many staff alike !! Good riddance to the end of the BASSA bullies.........you will have no public support whatsoever.......