In this Schedule—

• “agreed margins of error” means any margins of error agreed between the electricity supplier and the customer;

• “approved” means approved by or under regulations made under paragraph 3;

• “electricity supplier” means a person authorised by a licence or exemption to supply electricity;

• “exempt supply” means a supply of electricity to any premises where—

  1. a

     the premises are not premises used wholly or mainly for domestic purposes; or

  2. b

     the electricity supplier or the customer is a person authorised by an exemption to supply electricity to those premises;

• “prescribed margins of error” means margins of error by reference to which standards may be prescribed as mentioned in paragraph 6(2).