Since January the 1st 2021, the Brexit has deployed all its effects, which means that UK nationals are no longer EU -citizens. UK citizens may now travel to Spain, as well as to any other Schengen country, and remain there continuously for up to 90 days in any 180-day period. For longer stays, as well as to be able to work in Spain, they will need to apply for a residence and work permit.
More information about the possibility to apply for a Golden Visa can be found in the Informative Note below from our member ECIJA