43.1  Definition of Authority Default

Each of the following events, shall for the purposes of this Contact constitute an Authority Default:

(a)  an expropriation, sequestration or requisition of a material part of the assets and/or shares of the Service Provider [or Holdco] by the Authority or other Relevant Authority;

(b)  a failure by the Authority to make payment of any amount of money exceeding (in aggregate) [insert a sum equivalent to an average Monthly Unitary Charge] (indexed) that is due and payable by the Authority under this Contract within twenty (20) Business Days of service of a formal written demand by the Service Provider, where the amount fell due and payable two (2) (or more) Months prior to the date of service of the written demand;

(c)  a breach by the Authority of its obligations under this Contract which substantially frustrates or renders it impossible for the Service Provider to perform its obligations under this Contract for a continuous period of two (2) Months; or

(d)  a breach by the Authority of clause 47.3 (Assignment by the Authority) occurs.