Originally Posted by Alex2020
Oh, and I have the Spanish family book in hand (which my sister recently used to get her Spanish passport for the first time, a few months ago. I had one when I was 16 or 17. I'm now 42).
Not sure if that helps
you will not have an issue, but in case of disasters, legal issues and the like Spain will not recognise your British nationality and will not give the British consulate access whilst you are located in Spain. As regards health care, I have no idea, but given you have not lived in Spain nor paid into the system you may not have automatic access.