The Plant Health (EU Exit) Regulations 2019

21.  The intensity of the checks must be based on the risk of the plants carrying the plant pest or its known or potential vectors, taking into account—

(a) the provenance of the lots in the consignment;

(b) the degree of susceptibility of the plants; and

(c) the extent to which each operator in the demarcated area has complied with the restrictions on the movement of susceptible plants under the relevant Plant Health Order and with any other official measure imposed on the operator to eradicate or contain the plant pest.