I'm not a 100% on this, but I think UKC sometimes change up URLs to images to prevent people using them for free image hosting. Instead of using URLs like
https://img.ukclimbing.com/i/391047?fm=jpg&time=1658153030&s=a1b8db4edee54af8422f25ec6f2cd5ee
Safer to link to the UKC page like this
https://www.ukclimbing.com/photos/dbpage.php?id=465275
as I know they make sure these URLs don't break.
👍