Consider this. If you own a property in Spain, and decide to move back to the UK and buy a home, you will pay an additional 3 per cent of stamp duty land tax (SDLT) if you buy before selling your home in Spain. The good news is you can apply for a refund once you sell your home in Spain, but still. Tax, tax, tax, wherever you go.
http://www.ft.com/intl/cms/s/0/01e4ea10-f81c-11e5-96db-fc683b5e52db.html