I’ve tried searching myself but the results I’m getting are a few years old.
I am sure there was something this year where someone had done a DIY solution and linked to the bits needed
Ta
There were two around about the same time; this was one of them: https://singletrackworld.com/forum/bike-forum/bike-storage-yawn-hanging-bikes-vertically-against-a-wall-but-not-on-a-track/
...and the other one
https://singletrackworld.com/forum/bike-forum/bike-hanging-suggestions
For what it's worth, I bought 4 of the Decathlon blue bike wheel hooks and some big 2x6, and installed them on my shed wall. Happy with the outcome.
There was also this one:
https://singletrackworld.com/forum/bike-forum/so-i-fitted-a-sliding-hook-storage-system
Thanks all, it’s the one linked by ads678 I had been thinking of