[Keith]

These rules will have been in place before but seventy years ago we had less of a mainstream media.

I'm inclined to agree that it's quite likely these rules were probably drawn up many years ago. Limiting footage of the lying in state would be reasonable, if only to stop them from showing clips of members of the public and certain celebrities walking through. Similarly limiting pre-funeral service indoor coverage to prevent re-using the couple hours of dignitaries waiting also ensure the media don't show it later in the context of someone who is later publicly disgraced.

Apart from instances such as these limiting use of footage of the actual service and specific events/services seems a bit outdated. I also doubt it would be easy to enforce outside of the UK, beyond restricting those media outlets to future events involving the royal family. I dare say they may be conscious of certain parts of the media wanting to re-use footage of Harry & Megan to make a few more Channel 5 type documentaries, and by limiting the amount of footage it makes this harder. I also wonder if they might be wanting to limit reshowing footage of Prince Andrew from the funeral.