Thanks FB - just called them, Said person needs to apply for an S1 (meaning they are permanantly going to be living outside of UK), and they will get FULL SS ENTITLEMENT/HEALTH CARE - even though they are under Spanish retirement age (65), as they are already in receipt of full UK State pension.
Automatically once all applied for (need to go to SS office here and register of course, where they will give you other forms/contact Newcastle), one will be issued with a UK ECIC - the card that covers one for EMERGENCY medical treatment withing the EC. So it seems one does not have to go through the hoops of doing in here (and the long ques in the SS office and having to renew every year or so, although I have been told one can do this on-line now - But not sure if that was for the Spanish version or the UK one).
Sort of got my answer, but even Newcastel don’t have all the Q’s within one dept and you have to phone 2 or 3 no’s to get the full picture 😉
Getting there 😊