I think people watch questionable torrent downloads at the time they are shown in the UK. They seem to have them saved, as they are referring to rewatch. I don’t think there is any other way to do it. When I have asked this question before the answers are always like that. There are some people who know how to do this, but I am not one of them.
Incidentally, I see that original Morse is available on Britbox, which I have as an add on to Prime. Since I’ve never seen it, now I can have some fun summer viewing. I started by watching Lewis, which made sense on its own. Since I liked it I then started watching Endeavor, which also was fine as a stand-alone.