Spent three weeks lost in Spain (hired a car, my lady "navigated") a couple of decades ago. Thought the north was far better than the south and that Barcelona was a wonderful city.
By comparison the south was crime ridden (not necessarially a well founded opinion) so one would need to live in a gated area: With a bunch of Poms? Having lived most of my life in the tropics maybe I think the grass is greener too and would like to retire in a cooler clime.
I (personally) would research Costa Brava, being close to Barcelona, Andorra and Europe generally. Spain is large for a European country and the Costa del Sol is a long way from Europe. I may be wrong but I got the impression that there was a north/south division in Spain that was very similar to that which exists in Italy. Almost two different races of people and I preferred the northerners.