Having done an audit these pages showed up. https://www.railwayphotography.co.uk/author/admin/ https://www.railwayphotography.co.uk/category/uncategorized/ https://www.railwayphotography.co.uk/railway-blog Where on Wordpress can I find them to delete them? I have looked on ‘All Pages’ but they are not listed there.
You can use the Yoast SEO plugin to remove the author/admin/ page. Go to " search appearance" and then "archives". On author archives settings, press disable. And for the category page "uncategorized", you can rename it to something you will use and then use it. You can find it in your wp dashboard in, posts - categories. Just edit and rename it.
As far as the railway blog, the link goes to a 404 page. It doesn't exist. I don't know what kind of audit you have done, but you may still have a link to that page somewhere in your site. A link checker would be able to locate it if you can't find it.
This is your own profile link .... So you can change it from profile page ..... Because if you will post in wordpress then wordpress create a link to post author and your name is admin. Its not a page, I dont know what to say but can say that its a function which is creating a author page. Its default category in wordpress. You can rename is like "General" because if you will post without select any category then posts goes to default uncategorized category. This page is showing 404 means this page not exist now. If you want to block these pages then i think set these URL in robot.txt as DISALLOW and search engines or other audit report tools will not crawl these.