Spain will require travelers from UK to show diagnostic test or be fully vaccinated

Update. The Spanish government will require all arrivals to Spain from the UK to present a negative COVID-19 test prior to arrival (e.g. PCR, TMA, LAMP, NEAR) or proof of vaccination on entry. Details regarding COVID-19 testing requirements and proof of vaccination can be found on the Spain Travel Health page. 
These measures will enter into force 72 hours from 00:00 on the day of their publication (June 29) and with an end date on July 31, 2021 More information here

List of countries / Risk Zones
LIST VALID FROM 12:00AM (MIDNIGHT) ON JUNE 28th, 2021 AND WILL BE VALID UNTIL 12:00AM (MIDNIGHT) ON JULY 4th, 2021