British driving licence Spain only valid for 6 months. (Unless applied to swap while EU citizen December 2020) Update Ambassador 31/10/21
Very helpful member
Third non EU countries with which Spain has signed agreements for the exchange of permits are: Andorra, Algeria, Argentina, Bolivia, Chile, Colombia, South Korea, Croatia, Ecuador, Japan, Morocco, Peru, Dominican Republic, Paraguay, Switzerland, Uruguay , Venezuela, Brazil, El Salvador, the Philippines, Guatemala, Serbia, Turkey, Tunisia and Ukraine.
Last update British Ambassador is hopeful for UK driving licence extension in Spain