@korina Ok, thank you, I was trying to find information about what happened, but didn't find anything.

It's not only related to the UK, I also have that problem. It's been at least more than a week since this happened. The satellite images only update every 15min instead of the usual 5min. They also are low quality/lower resolution now.

You can see how it only updates every 15min in this video I recorded. You can also see the image on the left has a lot more quality than the one on the right.

Here's an image showing the lack of quality on the right image. You can see the right image is not as detailed and is more blurry which wasn't the case some days ago.

This website, kachelmannwetter, also has the same problem, it had images every 5min now only 15min. The 5min images disappeared around the same time as Windy stopped providing 5min images, so probably this isn't specific to Windy.
Here's a link to the website, you can only select 15min images too, but at least the images didn't lose quality like in Windy, they are still sharp even when zoomed in.
https://kachelmannwetter.com/ch/sat/67f8c8c932ff24f5d0d7cce61f29713f/satellit-hd-15min.html

Because it also happened on other websites maybe it's not something you can fix?