Only an insane person or group of people would 'sign off' on anything at all when currently within a period of negotiating pay and conditions. Everything comes at a price - this proposal should come at an extremely high price for Airservices, not an insulting 3 hours of overtime.
The accountability question is spot on. It is just layer after layer after layer of buck passing, lying, denial and outright incompetence within Airservices management.
As a 'company', Airservices international reputation is rapidly being destroyed by their own stupidity. I think it is called unconscious incompetence - correct me if I'm wrong.