There is no loss of license or private health care. J2 offer a discount with BUPA but its nothing special, in fact, If you enquire yourself, you can get a similar deal.
The current salary exchange (not a benefit so to speak) is only good if your fully employed and on the high tax band.
I think cooperating with the union, and listening to employees for what they would like, would go a long way. Of course the demands of the employees can not all be satisfied.