From. British Embassy in Madrid.

(Brits in Spain)

Full details from post the other day.

*Change to Spain's entry requirements for visitors from the UK*

If you have friends or family coming to visit from the UK, please note that Spain's entry requirements have changed to allow travellers aged 12 years and above to enter Spain by presenting documentation that certifies they have recovered from COVID-19 in the last six months. 

That means that if you are travelling to Spain for tourism purposes, you need to either be fully vaccinated or have recovered from COVID-19 in the last 6 months and use your  medical certificate or recovery record to enter Spain. 

For further details visit https://www.gov.uk/foreign-travel-advice/spain/entry-requirements.