Mr Pony
Your speculation as regard future BA action fits in with my own. I wondered at the time why BA was sending individual contracts and "I'm not in the Union, honest" forms to people it knew were in BASSA. Then it was suggested to me that it would provide very good intelligence for BA as to the possibility of winning a de-recognition ballot, ie if lots of remaining BASSA members tried to accept the offer.
It's at times like this that Unions really wish they hadn't agreed a check off deal with an employer. BA has a very good idea how many members BASSA has, just by looking at how many staff have subs deducted from their salary each month. They know how many stopped paying in time to make a honest declaration when signing their acceptance of the offer. They also know how many signed the offer but are still in the Union and so will be getting, or already have a "We regret, but..." letter saying they can't accept the deal as individuals.
All the above is very useful in giving BA an idea as to whether or not they'd win a derecognition ballot if they went for one. It's actually high risk as, if they lose, they're stuck with BASSA for another three years at least. However, if the numbers look good, they can at least threaten Unite with it. The key point here is that, whilst BA could not use the offer to induce staff to leave the Union, there is nothing as far as I know that stops them using the offer to induce staff to vote against maintenance of the collective bargaining agreement. If I'm correct on this, then BA could go for derecognition, and state that if they win then they'll retable the offer and thereby allow Union members to sign up to it.
The above is all speculation. However, I keep thinking back to the AGM where Walsh and Broughton apparently said they were "sick and tired" of BASSA, which is somewhat undiplomatic langauge to use about an organisation they expect to continue as a valued partner in the business. The fact is, though, that BA know exactly where they stand in terms of the numbers wishing to accept their offer, whther those numbers are good or bad. Unite/BASSA don't. All they know is that turnout in their ballot was poor, with roughly one quarter of crew rejecting the offer. A little over 10% signalled they wanted Unite to accept it, leaving Unite unaware of the true feelings of the other 65%. BA, on the other hand, does know what they want. It may be good news for BA or bad, but at least they know. So, BA has full information, Unite doesn't. Familiar story, I think.