The penny hasn't dropped yet has it?
Just in the same way many of the previous grievances wouldn't have arisen had negotiated and there hadn't been a strike, the additional new grievances wouldn't have arisen had BASSA reached an agreement with the company.
The original call to strike was to "send a message" to BA. And BA has duly sent one back to BASSA that it will carry on without you.
In other news: Brent crude hit $119 a barrel this morning.
If the oil price carries on increasing, there may be more "impositions" for BASSA to wail about.