4. As regards any heather fell which is the subject of an agreement—
(1) the farmer shall, in relation to Schedule 1 paragraph 5, observe the provisions of sub-paragraphs (2) to (6) inclusive only;
(2) the farmer shall not increase existing stocking levels and shall not in any event exceed a stocking level of 0.1 livestock units per hectare from 1st March until 30th September in any year.