Just a small update:
Yesterday a few employees of Ineco (a subsiduary of Aena... or as we say here "same dog with different necklace") entered Madrid ACC in order to perform a job-audit... while to my knowledge no one had any atco experience.
After the atcos refused (while at the same time still controlling) Aena threatened with disciplinary action and possible job termination for all those present.
As you can imagine things got a bit
heated and for a while the possibility that the whole of Madrid FIR/UIR would be closed seemed very close at hand. (Both Aena and Usca blame the other part for that... as I wasn't there I could not say for sure)
AENA amenaza con cerrar el espacio aéreo de Madrid si los controladores no admiten la fiscalización de su trabajo | Controladores aéreos españoles
Fly safe and if you happen to go to/over Spain I would load some extra fuel and patience... you'll never know...