The Authority is satisfied, that through custom and practice, overtime arrangements applying to Air Traffic Controllers form part of their conditions of service................. The current overtime arrangements were introduced as part of an overall agreement reached with Controllers under Clause 2 (iii) of Partnership 2000 for which they received a 17% pay rise.
Overtime is voluntary but it's part of your terms and conditions so employer has a right to expect it?
As a NATS controller I find this very interesting.