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Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
Rentals are invariably taxed in country of origin so you will have to declare to the Spanish tax authorities. The rentals will also be taxed in the UK. However, under the Double Taxation Convention between the UK and Spain any Spanish taxes paid will be allowed as a tax credit against the UK liability. The Convention precludes the same income stream being taxed in both jurisdiction. It does not protect you from differences in rates of taxation.
I do hope that you have found my reply of assistance.