To be fair Litebulbs, you've had pretty much exactly that across the rest of BA. Sure, unions and management disagree, but they find a way through. The aspect of Phil Rigg's interesting post that is overlooked is that whilst you might have the result spun as a 3-1 vote in favour of action, provided a union isn't completely stupid, then it will be perfectly well aware that 75% of its membership did not vote in favour of industrial action. Therefore it will be cautious about calling a strike given there is every chance a substantial number of staff will cross the picketline.
Clearly, there isn't much enthusiasm for strike action amongst the BAA workers. Calling them out would be extremely risky. To that extent, BASSA have been a bit unfortunate (initially) in the BA case - they DID get a mandate for strike action. It's just that most of the crew ignored the call.