1. Subject to paragraph 2, the GB Authority and the NI Authority must each establish a system (a "data reporting system") for persons to report data to it under Chapters II and III of this Regulation.

2. The national regulatory authority need not establish a data reporting system if it determines that it is unnecessary to do so, because it is able to obtain by other means the data specified in Articles 3, 8 and 9, or sufficient of that data to carry out its REMIT functions.

3. The national regulatory authority must establish a data reporting system -

(a) as soon as reasonably practicable after IP completion day, unless it makes a determination under paragraph 2; or

(b) if it makes a determination under paragraph 2, but later determines that the condition in that paragraph is no longer satisfied, as soon as reasonably practicable after it makes that later determination.

4. Paragraphs 5 to 7 apply where the national regulatory authority establishes a data reporting system.

5. The national regulatory authority must publish a notice specifying the date from which the data reporting system will start to operate.