Mimi, the way I'd do this is to use the built in WordPress 'Custom Fields', which allows you to set fields on a per-post basis. You can then fill them in one the relevant posts and automatically display those fields on a post in the single post template. This method would require a tiny bit of coding but am happy to help if you find your shortcode thingymabob doesn't do what you need.
Thank you, Jem! I don’t have a shortcode thingamajig as far as I can see. I may once have done, maybe on my old site. Or maybe Russell is thinking of something else, perhaps the custom fields. I know I did set up custom fields on my old website, years and years ago, but if I had them for this one they’ve disappeared.
I couldn’t find anything to do with this when I looked today so it either means I have deleted something, or Russell is speaking g about a previous incarnation of my site, or I’m just not seeing it.
So, I know I’ve done this in the past, so I’ll have a look to setting it up again with Russell’s help tonight and hopefully we’ll get that done with custom fields. If we get stuck with anything I’ll see if you have any advice, but I’m hopeful as if I know I managed it some ten or so years ago. Thank you! x