"the plans for food and animal sanitary and phytosanitary (SPS) checks at the site had been scrapped."

- which raises the question where those obligatory tests will be carried out instead.

But, why are those tests obligatory for plants coming into UK from EU? We accepted the plants before Brexit, so obviously believed that the EU had sufficient checks already in place on the plants, whether sourced from the EU or transiting through the EU.
The fact that we are now entitled to insist on such checks doesn't mean that we have to.