For every relevant Southern Basin or onshore field, as defined in subsection (2) below, section 8 of the Oil Taxation Act 1975 (the oil allowance) shall have effect subject to the following modifications—
Subject to subsection (3) below, for the purposes of this section a "relevant Southern Basin or onshore field" is any oil field other than one—
In determining, in accordance with subsection (2) above, whether an oil field (in this subsection referred to as "the field in question") is a relevant Southern Basin or onshore field, no account shall be taken of a consent for development granted before 1st April 1982 or a programme of development served on the licensee or approved by the Secretary of State before that date if—
Subsections (4) and (5) of section 36 of the Finance Act 1983 (which define "development" for the purposes of subsections (2) and (3) of that section) shall apply also for the purposes of subsections (2) and (3) of this section.
This section shall have effect in relation to chargeable periods ending after 30th June 1988.
This section shall be construed as one with Part I of the Oil Taxation Act 1975.