On the IATA site, among the many categories that are listed as able to enter Spain are "passengers arriving from" certain countries, and "residents of" certain countries "when arriving from the country of residence". That is, with the first category, it seemingly applies to all passengers from a given country; with the second, it seemingly applies only to the residents of the country. On 8:15 UTC, July 20th, 2020 and for some time previously, the site had the United Kingdom in the first category; however, currently (5:00 UTC, July 21) it places it in the second category.
Does this represent an actual change in the travel restrictions of Spain? I searched, but I could not find any information about such a reclassification.