You would have to move inland which is very hot in summer and very cold inside during winter. Many find they miss friends and family, get bored or run out of money which is why half return back to the UK
I would suggest you save enough to rent for 6 months minimum without selling in the UK to see if it really is what you want before taking the plunge.
Even better, rent out your home for a year in the UK and rent in Spain for 12 months. Property prices are at east as likely to rise in the UK as they are in Spain with many predicting falling prices in Spain