8.—(1) In the case of gas and heat, these Regulations apply to the following activities—
(a)the provision or operation of fixed networks intended to provide a service to the public in connection with the production, transport or distribution of gas or heat;
(b)the supply of gas or heat to such networks.
(2) The supply, by a utility which is not a contracting authority, of gas or heat to fixed networks which provide a service to the public shall not be considered an activity within the meaning of paragraph (1) where—
(a)the production of gas or heat by that utility is the unavoidable consequence of carrying out an activity other than one referred to in paragraph (1) or in regulations 9 to 11; and
(b)the supply to the public network is aimed only at the economic exploitation of such production and amounts to not more than 20% of the utility’s turnover, calculated on the basis of the average for the preceding 3 years, including the current year.