1Gas supplied through pipes, otherwise than for industrial purposes as mentioned in section 9(4) of the [1964 c. 29.] Continental Shelf Act 1964.
2Natural gas (that is to say, gas derived from natural strata) in so far as it does not fall within the preceding paragraph.
3Electricity.
4The carriage of passengers by road or rail.
5The carriage of goods by rail.
6The services of conveying, receiving, collecting, despatching and delivering letters.
7The running of any system for the conveyance, through the agency of electric, magnetic, electro-magnetic, electro-chemical or electro-mechanical energy, of any of the matters specified in paragraphs (a) to (d) of section 24(1) of the [1969 c. 48.] Post Office Act 1969.