For UK naturals the Brexit could raise some questions about the right of residence in The Netherlands. The Immigration and Naturalisation Service gives answers to these questions using two simplified animations.
For UK nationals in The Netherlands without a residence document on January 31st 2020:
UK nationals in The Netherlands with an European permanent residence (duurzaam verblijf) on January 31st 2020:
For more answers to your questions, we kindly advise you to consult this IND article about the transition period after Brexit and other general information.