Around 500,000 British holidaymakers are believed to be in Spain.
A further 1.6 million people are estimated to be booked to travel from the UK to Spain in the next month alone; it is by far the most popular destination for British holidaymakers.
These are the implications for their trips.
What has happened?
On 25 July, the government warned against all non-essential travel to mainland Spain. It was in response to several spikes of coronavirus infection in the northeastern provinces of Aragon, Navarra and Catalonia.
Less than 48 hours later, the Foreign Office also advised against all non-essential travel there to the Balearic and Canary Islands.
The FCO now deems all of Spain to constitute “an unacceptably high risk for British travellers.”
In addition, all holidaymakers returning to the UK must self-isolate at home for 14 days, following the date of their arrival.