We all kniow the shortcomings of other initiatives of this sort, and why the heritage machine guardianship and policing isn't ideal, but funnily enough the Highway Code and Countryside Code are not just for the public - it is the same for everyone.
Similarly any monument code should be sent to the BBC and other TV companies as well as EH and NT and they should be put in a position where they want to sign up adopt and implement it.
This is not about what I think should be the code, unless everyone contributes to the detail it simply won't become workable.