1. 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—
the premises are not premises used wholly or mainly for domestic purposes; or
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).