63.—(1) A participant may request in writing the following information from those authorised suppliers of electricity or gas which hold a licence to make such a supply—
(a)the amount of electricity or gas supplied to the participant in the year in which the request is made; and
(b)how much, if any, of that supply has been estimated by the supplier and the period to which such an estimate relates.
(2) Where such an authorised supplier receives such a request, the supplier must reply in writing within 6 weeks of the end of the year of the phase to which the information relates.