So we've got the offer.
Does it even need discussing any further on here? It will be a yes. NERL will vote yes. NSL have the met issue to contend with, however there are very sizeable units in NSL that this won't affect, so they'll vote yes. That leaves the affected NSL units. After the union have "encouraged proper and full debate" on the issue (for that read a joint presentation with management to tell us why the why the world will end if we don't accept), enough people will vote yes, ensuring that the NSL vote on the whole is a yes. Job done.
I note that the Engineer and ATSA sections are not recommending their deal (its worse than the ATCOs), and the imbalance between NSL/NERL.
Divide and rule - they have - they've won.