> They took almost 4 years to do it in January of 2020 after 4 years of arguing about it with a transition period and trade talks with the EU until the end of 2020.

Oh, longer than that. Some transition arrangements are _still in practice in place_, for instance see https://www.politico.eu/article/uk-brexit-border-checks-dela... . Brexit is not done, yet; things will get worse before they get better.