Thanks for your input.
I am just using the WP importer and got no errors on import.
I think the problem might be that I imported pages into a site using a different theme. Secondly that I am using a different content editor. Caching seems to be the issue too. So I have found that if I edit a page with Elementor and clear the cache I can then see the page without the 410 error. I will mark this as resolved.
