If you are thinking about travelling to the UK, do make sure you are aware of the rules on entering the UK from Spain. You can find more information at: https://www.gov.uk/uk-border-control. One of the requirements is to provide proof of a negative COVID-19 test taken in the 3 days before you leave for the UK. You can find more about the types of tests that are valid for entry to the UK at: https://www.gov.uk/…/coronavirus-covid-19-testing-for…. Some tests are quicker than others and the results may be available the same day. We are not able to recommend testing centres in Spain. However we do have a list of English-speaking private medical practitioners here: https://www.gov.uk/…/spain-list-of-medical…, who may be able to provide the test or signpost you elsewhere.