My php skills are beginner level at best, so there are probably a lot better ways to do this. I was trying to create a shortcode to add an hour to time and the following actually works.

I am amazed that it worked and happy that after all the examples you've given us, I can give something back.

You can use the example below to add a static image header to all emails sent from your forms. Replace the URL below with an image URL of your choice.