Coming back to this.
Originally I was thinking of the main page heading, at the top of the page by default, not really what you would call the main content area.
For many pages we don't have a heading at the start of the main content, we use the banner heading to signify the "heading" for the main content on many pages, and when there is no clear decision the about the heading the sites/courses full name is used.
If the concern is simply that there be that constant header then we can identify all pages that are not setting it and look at them (I have a script for that) but we would still need to review every entry page to make sure that the heading being used is meaningful.
However I get the impression reading this issue that perhaps we need to either have a heading in the main content of link the current heading (aria-labelledby perhaps) to the main content.
If thats the case then fine, we still need to review every page, but this time we would be looking to add a second heading where there isn't already one and make sure that the two headings are both meaningful and not duplicated.
Greg would you mind shedding some light on this, I think either way it is going to be a big job which isn't a problem but before I start I want to know that the time I invest will be spent in the right way.