Just been reading up on new rules for TIE card.
This came direct from the Spanish State BOE.es on 2/07/20
A trifle confusing because it does mention changing green card for the new one.
BUT... Last paragraph
when referring to those of us with “ permanente “ on our green card it stated
“the nationals of the United Kingdom, the members of their families and any other persons residing in Spain in accordance with the conditions established in the Agreement will not be obliged to apply for a new status of resident nor, therefore, submit to a new documentation”
So you, like the rest of us, can relax 😉 Feet up and enjoy this incredibly hot weather