Official rules and regulations for travel between Spain and the United Kingdom
UK GOVERNMENT WEBSITE Travel Advice to Spain
Here you will find up to date government guidelines on exactly what is required to travel to and from the UK to Spain.
Currently (December 2021) - On arrival into Spanish ports and airports you must show the QR code (hardcopy or digital) issued when you completed the online Health Control Form before travel AND proof of being fully vaccinated.
If you would like to double check what you have read on the UK gov website against Spanish government travel rules, look here:
SPANISH GOVERNMENT WEBSITE Travel Advice
QR Code and Health Control Form
- If you are travelling to Spain, you must fill out a Health Control Form
within 48 hours of travel: see page spth.gob.es
or by downloading the app on your mobile from the same page. You will then receive a QR Code, which you must take to the airport with you for travel - either printed out or on your phone.
Here is an article on the BBC website explaining travel rules between the UK and Spain, dated December 2021.