The House of Lords European Union Committee has produced a report on plant and animal biosecurity after Brexit: Publication
The report notes, 'The UK currently follows EU legislation on biosecurity, with decisions on implementing biosecurity measures made predominantly at an EU level. The UK also benefits from EU-wide intelligence gathering and disease notification systems, systems for tracing plant and animal movements, and coordinated research efforts. When the UK leaves the EU, it will no longer automatically be part of this framework.'
It states, 'We urge the UK Government to negotiate continued participation in as many of the EU’s notification and intelligence sharing networks as possible. We note also the significant work that remains to be done to ensure the UK has a replacement legislative framework in place, along with the monitoring, inspection and enforcement mechanisms, staff and IT systems to support it, by the time the UK leaves the EU. It seems doubtful this could all be achieved by March 2019, when it would be needed in the case of a "no deal" Brexit, potentially leaving the UK’s biosecurity compromised.'