you become a resident of spain, then just travel over to go offshore, takes same time as say getting the train from sheffield to Dyce.
you will need an NIE number once you have proof of residency ( house deeds or rental contract ) then contact spanish authorities for tax purposes.. you must have most of your assets in spain and not the uk for tax purposes, its easy opening a spanish bank account... hope this helps mate.
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depending where you want to live, but average rent £400p/m or around £120,000 for a 2 bed/2 bathroom apartment...