The Principal Act is hereby amended by the insertion of the following section after section 21:
"21A. Higher rate of corporation tax.
(1) In this section -
'construction operations' means operations of any of the descriptions referred to in the definition of 'construction operations' in section 530(1), other than operations referred to in paragraph (f) of that definition;
'dealing in or developing land' shall be construed in accordance with Chapter 1 of Part 22;
'excepted operations' means any one or more of the following operations or activities -
(a) dealing in or developing land, other than such part of that operation or activity as consists of construction operations,
(b) working minerals, and
(c) petroleum activities;
'excepted trade' means a trade consisting only of trading operations or activities which are excepted operations or, in the case of a trade consisting partly of excepted operations and partly of other operations or activities, the part of the trade consisting only of
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