A Defra spokesman said: "To aid in the transition, we have ensured there will be no checks on 'high priority plants' imported from the EU at border control posts
until July 2021. Checks will instead happen at place of destination from January 2021.
"It is vital we maintain our high biosecurity standards and we will not compromise on these as we move forward."
https://www.bbc.co.uk/news/uk-england-54210558
Defra PHSI have got form for suspecting every truck of carrying dodgy plants.