If the cost of this weekends action is £100m, as stated earlier on the tread, then six three day stoppages wipes out the £600m fighting fund. That cannot all be directed back to crew as that cost would be £48k per crew member (600000000/12500). What cost would that be to a striking crew member? A maximum of 18 days pay and staff travel, which appears to be gone now anyway.
There comes a point when the pressure will switch from the employee to the employer.