Do you understand the difference between what is legally req'd and the industrial agreements between BA and BASSA?
It is not, for example, a legal reqt to have 2 local nights off after a longe range diversion. The law reqs 12 hrs or at least the time of preceding duty.
And why not make alleviations during times of mass disruption?
BA crew work to very outdated and restrictive practices dating from the 70s.
These need to change to allow BA to respond to a crisis more quickly, and to operate more cost-effectively.