I have made the slideshow on the index page repeat on all pages.
Emmo, that's not quite what I see when I look at the site and tab through the pages. The index page is working with 5 images, but the other 8 copies have what I think is the old slider (though they do each show 5 images correctly). If you want them the same as the index, you may have to delete the old sliders from each of the pages (8 of them) and replace them with your new slider. However you have some pages where the slider is not designed to appear, so rather than have it repeat on all pages, I'd simply copy and paste the index copy to the other 8 pages.

Even with repeat on all pages set, changing one copy does not change any others; each paste also creates a new id.

But it does all work now

Gary

BTW there is at least way of having one copy update all other copies e.g. https://initiostar.co.uk/demo/repeatWidget/. But as you have it working now probably best to keep it that way.