Automated methods are generally rapid and convenient but cannot identify all accessibility issues. Human review can help ensure clarity of language and ease of navigation.
I have run a test on the henter joyce page that we looked at earlier and as we can see errors have been found at priority 2 level, the large image may be used to convey meaning. These types of error must be human checked as in this case alternative links are supplied on the page so the image is not the sole means of navigation.

If we click on one of the errors, bobby makes a sugestion on how to fix issues, for example the long description tag.