The policy is to offer VR first (assuming the cash is available in the affected Unit's budget to pay for it), followed by volunteers to relocate (assuming there's a vacancy to go to), followed by compulsory posting under the 'mobile grade' clause in your contract, followed by CR.
Big issue for ATSAs (and others) is the use of compulsory posting (CP) - if you cannot accept a posting for whatever reason, then you are deemed to have resigned. No payoff - straight out the door (with a pension where applicable)
The one saving grace (if you can call it that) is that once the 220 ATSAs have 'done an Elvis', the options for future CP diminish for the survivors, and if out of the 220 required, 150 volunteers come forward for VR, that also takes a bit of pressure off those trying to stay in employment.
However, the options are there for Mgmt manipulation, and I predict that there will still be casualties further along the way
oh, BTW, just as minesapint pointed out earlier "the ATCO's and engineers will not support their ATSA colleagues"
as if we didn't know...