12 The Treasury may by regulations amend this Schedule so as to -
(a) vary or omit any of paragraphs (a), (b) and (c) of paragraph 2(1);
(b) change the percentage figure specified in the definition of "surrender limit" in paragraph 3(2);
(c) amend paragraph 6 (meaning of "relevant contract");
(d) amend paragraph 9 (exclusions from the operation of this Schedule).