Dear Customer,
Please be advised that only Spanish and Andorran citizens or Residents of Spain/Andorra who are in possession of either a Spanish national identity card, Spanish passport or Spanish residence card and have the necessary QR Code or paper PLF and Negative Covid19 test (PCR/TMA/RT-LAMP) conducted 72 hours prior arrival or is transiting will be permitted to travel.
Non nationals or residents will not be allowed to board flights from the UK to Spain.
This is from Ryanair 15:28 26/12/2020