The Commission shall -

(a) as soon as practicable after the decision under section 124 or 125 is made by it, give the controller or processor concerned a notice in writing setting out -

(i) the decision and the reasons for it, and

(ii) where applicable, the corrective power that the Commission has exercised in respect of the controller or processor,

and

(b) in the case of a decision under section 125, give, as soon as practicable after the notice under paragraph (a) is given, the complainant a notice in writing setting out -

(i) the decision and the reasons for it, and

(ii) where applicable, the corrective power that the Commission has exercised in respect of the controller or processor.