Why would you want to reference cultural values George?

The UNESCO definition specifically refers to value: The plural of that definition applies to either a multiple of the singular (values as in benefits or worth) or values (as in cultural meaning to people). Because they have been specific about the meaning by not referring to the plural, (even though the two plurals have a related meaning), any reference to the secondary plural meaning is likely to be ruled as irrelevant in a consultation.

The Australian Government tried to define meaning and came to the same conclusion about what it meant. If you're particularly interested, I can email you the document.

If you think that UNESCO meant something different, then you may be right, but it would be difficult to argue for your interpretation of meaning if a commonwealth archaeological authority has spent the time to define the meaning and found it to be something else.