(1)Chapter 3 of Part 2 of CAA 2001 (qualifying expenditure) is amended as follows.
(2)In each of sections 21 and 22 (buildings, structures, assets and works), at the end of subsection (4) insert “(but any reference in list C in subsection (4) of that section to “plant” does not include anything where expenditure on its provision is excluded by this section)”.
(3)The amendments made by this section—
(a)are treated as always having had effect, but
(b)do not have effect in relation to claims for capital allowances made before 29 October 2018.