...
Heading control: Whilst heading control for heading level automatic is a considerable subject, this is one area where we may be able to relax as we know that any heading in the page header will be an H1.Item: Description
Image Performance & Lading: In all cases except where the page header is visually hidden, where imagery is used, it will be visible in the opening viewport. It is therefore likely that any imagery in a page header should be eagerly loaded. The wider discussion though needs to be about what our decision criteria and methodology for lazy loading of imagery is.
Inspiration from elsewhere
...