With the UK's withdrawal from the EU on 31 January 2020, a transition period will begin until the end of 2020. During the transition period, the current rules will continue to be in place as if the UK were still a member of the EU.
Further information on the import of animals and products of animal origin from EU-countries
The effect of Brexit on the import of plant products
European Commission: Effect of Brexit on AGRIM import certificates and import rights