Can't access site after changing WordPress Homepage address in Setting-Reader

I wanted to see what a catagory page my client liked would be like as the homepage so I changed the WordPress home address in Settings/Reader Settings from http:druke.co.uk to http://druke.co.uk/category/the-business4society-foundation. Now I can’t access the proper site or access the control panel. So I can’t undo what I did. Help!

Try editing your wp-config.php file (download via FTP); and put the explicit URL for your website in the file per the WP codex on how to edit wp-config.php file.

See
https://codex.wordpress.org/Editing_wp-config.php#Blog_address_.28URL.29

You should not change the web address setting in your blog unless you know what you’re doing — obviously 😉