Click the (i) icon next to a URL and if it’s not secure Google Chrome reports:
Your Connection to This Site is Not Fully Secure
Attackers might be able to see the images you’re looking at on this site and trick you by modifying them.
The obvious cause was the image I’d manually added to the main content which loads the image URL http://classic-literature.co.uk/wp-content/uploads/2017/01/edgar-allan-poe-photograph-600×840.jpg which isn’t the secure https/SSL version.
Easy fix would be edit the WordPress Post and add an s to the image URL, BUT I have dozens of WordPress Posts like this and I don’t fancy manually editing dozens of Posts to add an s!
Time for some SQL Search and Replaces to modify the database directly.
Continue Reading Moving a WordPress Site from HTTP to HTTPS SEO Guide