7. Where any vaccinated animal is to be introduced to premises outside a vaccination zone—
(a)it will not be subject to paragraphs 2 to 5, and
(b)if the proportion of vaccinated animals to be introduced is 75% or greater, then not earlier than 28 days after the last introduction of susceptible animals to those premises, the National Assembly must ensure that the vaccinated animals are randomly tested for the detection of antibodies against non structural proteins.