20In Schedule 3 to the [1974 c. 7.] Local Government Act 1974 (hereditaments to which section 19(1) of that Act applies) after paragraph 3 there shall be inserted the following paragraphs—
“3A(1)Any hereditament which a private supplier is to be treated as occupying in a rating area by virtue of section 33(3) of the principal Act as applied by order under section 33A of that Act.
(2)In this paragraph and paragraph 3B below—
' gas' has the same meaning as in Part III of the [1972 c. 60.] Gas Act 1972 ;
' private supplier' means a person authorised by a consent given under section 29 of that Act, or by section 29A of that Act, to supply gas through pipes to consumers' premises.
3BAny hereditament occupied for or in connection with the conveyance of gas through pipes other than one which—
(a)is occupied by the British Gas Corporation ; or
(b)is occupied by a private supplier for or in connection with the supply of gas through pipes to consumers' premises.”