An executive authority shall enter into a collective agreement in the appropriate bargaining council on any matter that has financial implications only if—
(a) |
he or she has a realistic calculation of the costs involved in both the current and the subsequent fiscal year; |
(b) |
the agreement does not conflict with the Treasury Regulations; and |
(c) |
he or she can cover the cost— |
(i) |
from his or her departmental budget; |
(ii) |
on the basis of a written commitment from the Treasury to provide additional funds; or |
(iii) |
from the budgets of other departments or agencies with their written agreement and Treasury approval. |