In my opinion (for what it is worth) I am in favour of anybody who can help keep our ancient sites in good order.
I have been to many places where they are simply being left to disappear back into the earth or where people treat them as a playground with the same result.
If a group is willing to do this sort of work then they should be able to ask visitor to treat them with respect they deserve.
As for leaving offerings, I think small floral items do not harm, but may give a sign for others (who probably don't know any better) to leave any sort of rubbish behind.
:o)
Chris
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