Prospect could ballot industrial action based on the belief of members that fully privatising a safety industry is not in the interests of the public, the business or the employees.
We all know they won't, but they could. Being mainly owned by the Government is a lot different than being owned by a company out to make as much profit as they can.
See the mess that the Spanish have made of BAA...
If the Post Office can succesfully fight full privatisation, you'd hope a safety critical business could make politicians see sense.
NATS and the Post Office - both a delivery service in a sense - just that the packages NATS are in charge of ensuring reach their destination are a little bit more fragile...