Paragraph 17
The appropriate UK plant health authority may lift the demarcation that applies to a demarcated area—
(a)
if the plant pest is not detected in the area over a relevant period during official surveys carried pursuant to paragraph 1(i) of Schedule 9 and the monitoring referred to in paragraph 11(i); or
(b)
in any case where, following further investigation, it is clear that the area need not have been demarcated for the reasons specified in paragraph 15(a) and (b).