Medical health insurance .

To obtain residence statue the medical cover must be 100%, for all conditions with no co-payment. So the same cover one would have on the NHS. You may find it impossible to get that cover with your medical history

The policy must be in Spanish or have a translation produced by a judicial translator  (court registered) and they charge by the word so a policy translation would be costly

As a couple you also need to prove at  least 623.73€ per month income or 8,632.22€ savingS

PS of course that applies only pre Brexit after that no one knows   It could be that a single person will need the medical cover plus income of 27.000€  per year as non EU nationals need now

Thanks for information john

When we first came to Spain 6 years ago we contracted for private health insurance through Sanitas.  We had it successfully for two years and when they started to call foul on preexisting conditions we converted to the Convenio Especial (buying into the Spanish care system).  In both cases, the price is low before retirement ag.  For the Convenio, (1 year residency to qualify), the rates are 60€ a month for under 65 and 157€ for over that age.  The main difference between Private and public care is the existence of waiting lists for nonemergent care in the public system.  Mind you, the quality of care in the Private as well as Public systems is excellent.  I broke my hip last year and had surgery as soon as it was discovered on the tests.