If you already have the light green card or certificate issued by the Spanish police confirming at the time of application you were a citizen of a country forming part of the EU (like the UK up to 31 January 2020) there is no requirement at this stage to apply for any additional certificate or authority to remain resident in Spain.

The United Kingdom left the EU of which Spain is a member on 31 January 2020. The subsequent transition period whereby virtually all matters remain the same ends on 31st. December 2020 and from 1st January 2021 the full effects of Brexit according to the International. Treaty known as the Withdrawl Agreement signed by the UK and the 27 countries of the EU comes into effect.