@mikh: przecież ci co mieszkają na stałe poza UK mogą tam zostać
If you are legally resident in Spain before the transition period ends on 31 December 2020, you will be able to stay. You must register as a Spanish resident if you want to stay in Spain for more than 3 months. Children must also be registered with their own residency document.
If you are living in Spain before 1 January 2021 and register as a resident after 6 July 2020, you will be issued with a biometric residence card called a Tarjeta de Identidad de Extranjero (TIE). This card will prove your rights under the Withdrawal Agreement.
Bylo mówione jasno że na brexicie nie ucierpi nikt z UE kto mieszka w UK ani nikt z UK kto mieszka w UE