“(1) Sections 21 and 22 do not apply to any expenditure to which any of the provisions listed in subsection (2) applies. (2)The provisions are— section 28 (thermal insulation of industrial buildings); section 29 (fire safety); section 30 (safety at designated sports grounds); section 31 (safety at regulated stands at sports grounds); section 32 (safety at other sports grounds); section 33 (personal security); section 71 (software and rights to software); section 40D of F (No.2) A 1992 (election relating to tax treatment of films expenditure). (3)Sections 21 and 22 also do not affect the question whether expenditure on any item described in list C is, for the purposes of this Act, expenditure on the provision of plant or machinery. (4)But items 1 to 16 of list C do not include any asset whose principal purpose is to insulate or enclose the interior of a building or to provide an interior wall, floor or ceiling which (in each case) is intended to remain permanently in place. LIST C Expenditure unaffected by sections 21 and 22 1. Machinery (including devices for providing motive power) not within any other item in this list. 2. Electrical systems (including lighting systems) and cold water, gas and sewerage systems provided mainly— (a) to meet the particular requirements of the qualifying activity, or (b) to serve particular plant or machinery used for the purposes of the qualifying activity. …. 4. Manufacturing or processing equipment; storage equipment (including cold rooms); display equipment; and counters, checkouts and similar equipment. … 22. The alteration of land for the purpose only of installing plant or machinery. 23. The provision of dry docks”