BA putting an offer back on the table is not going to happen I'm afraid.
Option 1: BA do nothing and the strike is over by Sat pm. BASSA destroyed.
Option 2: BASSA (UNITE) make a total and catastrophic climb down and call off the strike with no offer from BA. BASSA destroyed.
For BA this is largely nothing to do with T&C's now. BASSA must be taken out, and never allowed to hijack BA again. Period. And so it will be...