To avoid tensions and economic issues, the Ireland/Northern Ireland border doesn’t have border controls or import duties. However, that means you have to prevent goods that cannot be imported into EU unrestricted from leaving Northern Ireland somehow (otherwise, people will start businesses that systematically circumvent duties). The solution the UK government has chosen here are “not for EU” labels.
According to the headline I get, …
Doesn’t appear to be affecting the entirety of Spain. (Granted, parts of Spain are already desert and other parts export their water as produce.)