Tech,
You would be mad to take any sort of decision based on advice on this or any other forum. Bigwilly is just a spoof playing for attention and campana lives in a much higher price area than you do in Turre and, despite her strenuous denials, lives an above average lifestyle. So ignore both of those. Guslopez is a better model for you. He has a much bigger place than you and a pool to maintain but I doubt you'll match his IBI bill. But for food, Mercadona is Mercadona and the market is the market. So, with no rent to pay, you will live very comfortably for a lot less than €1,000 a month. And I get the impression that you are solo whereas gus would seem to be a couple. If so, you save again. Remember, most Spanish families live on €1,000 a month or less and have to pay rent out of that.
But you can do the sums for yourself. Go down gus's list and put in the numbers for your place and your lifestyle. Keep a record of what you spend when you're over in Spain and come up with a number specific to you. You may still choose to downsize in the UK irrespective of your numbers. If you are single, you don't need three bedrooms so cash in and spend it wisely getting pleasure. Can't take it with you.
Good luck and don't be put off the dream without being very sure of your facts.
Dennis