Paragraph 15
The appropriate UK plant health authority need not demarcate an area in relation to a finding of the plant pest in a relevant UK territory where—
(a)
there is evidence that—
(i)
the infestation has been caused by the movement of susceptible plants to the area of infestation and those plants were infested with the plant pest prior to their movement to that area; or
(ii)
it is an isolated finding which is not expected to lead to the establishment of the plant pest; and
(b)
it has ascertained that the plant pest is not established in the area and will not successfully breed or spread if appropriate eradication measures are taken.