Thank you for your reply. There’s a limited amount I can do, as I am not the main admin of the site, and the main admin is usually too busy to look into this sort of thing.
Just wondering, has it been tested with Elementor? That’s used on the site. (Personally I think it’s awful and wouldn’t recommend it to anyone, but that’s just my opinion).
I have spotted an error just now, which I will raise as a different issue, but maybe it is related.
Cheers.