Tax

If you live here for more than 183 days a year then you are tax resident.  Register with a good accountant. There´s a dual taxation agreement between Spain and the UK but the Spanish tax free allowance is a lot less than the UK so depending on your income you may have to pay a little extra tax here as well as the UK.  

I would advise you to contact Ben Simpkins in Costa Teguise and he will give you legally correct answers to your questions.  He may also ask you questions which you may not like to answer.

I have used Ben for ten years and he has kept me on the straight and narrow.  Fair price for a good service from a bi-lingual Spanish citizen.

If, for example, you still have any assets located in UK they may attract a local liability.