Unite didn't renege last time, it just couldn't control it's branches.
This highlights perfectly the madness of the entire situation. If BA keeps striking deals with Unite for which its Branches then continually scupper and Unite is not deemed to have reneged then this is tantamount to saying that Unite is not the responsible party with whom BA should be negotiating in the first place!
If Unite cannot agree a deal that it cannot persuade its Branches to accept then it has no business negotiating with BA and any such negotiations are by definition in bad faith as they are a complete and utter waste of BA's time. BA will continually, as it is right now, be drawn into negotiating against itself and being asked to give more and more and more.....
Lord knows how BA has ever allowed itself to get into such an impossibly ludicrous position as this. If I were BA I'd be looking to sort out this stupidity with the Union and its Branches very quickly, and by some hard-ball negotiations if necessary, particularly as BA holds all the cards.
If BA is ever going to move forwards as a competitive fighting unit in the airline industry it needs to sort out internal legacy messes like this and now is the time. When the dust settles things need to be a lot simpler with less organisations involved and more streamlined processes in place with BA running its IFCE operations while listening-out with a good ear to constructive feedback and practical comments from its frontline staff who provide regular service to its customers.