Yes, I have a hammerstone. It was ritually deposited and has never been used. Brand new! A person would need to have twice the strength of a modern person to do anything useful with it. The copper mine I talk about sometime has sections of the roof with identifiable hammered out sections.
Something else I noticed about the Stonehenge special - they didn't mention Darvill and Wainwright at all. The new construction sequence fits, but. And they were too down on Atkinson - who, at least, dug in the right places.