Litebulbs
The (civil) legallity of the action will, I think, be debated for a long time and as you say will not be settled until a court rules on the issue.
It is likely that whilst there is a valid offer on the table that it could prove difficult to raise any court action.
Admittedly one of the conditions attached is the ceasation of strike action (if permanantly of just surrounding this dispute, I don't know).
What seems odd is that the "give ST back" school do not seem to recognise or be aware of the offer as there has been no sense of any comment along the lines of "we want full ST returned as the BA offer is not enough"
I can see the concern of the commuters which this offer does seem to cover, is Unite deliberately saying nothing as it reduces their case for further IA?
What, further, seems odd is that no-one on the CC thread seems to have pointed this out to Ava, the very issue which seems to be making her vote to turn the offer down!