I have a question...because I went down a Youtube rabbit hole.
Some photos have confusing descriptions.
"final resting place"
but then it says: "The area she was buried in is an ornamental lake known as The Oval, located within Althorp Park's Pleasure Garden. There, you can find an arboretum where Diana and her loved ones, including her sons, had all planted trees."
So, Diana's Memorial situated on the edge of the oval lake can be visited by people, but the actual island, where the urn stands cannot (only by family)
Is the pilar with the urn then something like a headstone, and she is buried on the artificial island?