7(1)In this Schedule—
" petroleum " includes any mineral oil or relative hydrocarbon, and, except in the expression " crude petroleum ", includes natural gas ;
" petroleum products " means products derived from petroleum and wholly or substantially of a hydrocarbon nature.
(2)For the purposes of this Schedule—
(a)two companies are associated with one another if one is under the control of the other or both are under the control of the same person or persons, and " control" has the meaning given by section 534 of the Taxes Act;
(b)any question whether ordinary share capital is owned by a company directly or indirectly shall be determined as for the purposes of section 532 of the Taxes Act;
(c)rights are exercisable by a company if they are exercisable by that company alone or jointly with another company or companies ;
(d)subsection (6) of section 485 of the Taxes Act (which extends the provisions of that section to transactions which are not sales) shall apply for the purposes of this Schedule except those of paragraph 5(b).