BASSA are not the only one to be blamed. BA also have their "fair share" for not reaching an agreement. Assumingly because WW doesn't even want to. There were never any problems for him to reach an agreement with the pilots or the engineers for that matter.
I'm afraid that is simply not true. The biggest problem faced by BASSA was that they had held on to outdated conditions for so long by casting off outstations and LGW that the fall to realistic levels was always going to be impossible to sell. Thus BASSA were probably going to go down the IA route from day one as exemplified by their assertion that WW was 'out to get them' from the announcement of his tenure.
A deal was reached with the other Unions as they had the temerity to negotiate. BASSA wouldn't.