We'll have to agree to disagree Litebulbs. My view is that if you can legally withdraw pay to strikers, you can certainly withdraw perks. Indeed, it seems BA can even sack strikers (though they might have to pay compensation if the sackings occurred during the 12 week protected period of a lawful IA).
Doesn't really matter what you and I think though. The important thing is what do the striking CC think when faced with this next ballot. If they believe BASSA's advice that ST will easily be returned, they could vote to accept the deal. If they don't have faith in BASSA's promises re ST, they'll have to vote to strike in an attempt to get it back! Seems converse but things often seem to be in BASSAland.
I guess the answer will only be forthcoming if BASSA/Unite pursue the matter through the Courts.