Dave3 - you are missing the point - they 'volunteered' or if you like AGREED to help out cabin crew and be trained to do so - so as I said earlier its a different context.
As far as ground staff striking - how do you know they got paid and as I remember it was very short-lived. They didn't lose staff travel because agreements were made - they have a much more flexible union than BASSA. By the way ground crew would love to earn the same as CC.