Well they were only 3000 years out lol
See what's happening here ? Iron age nonsense being over turned. I told you so.
The uk was a flooded out watery world guys and they arrived on ships 10k Yo.

Expect much more.

www.sciencealert.com/mysterious-artificial-islands-in-scotland-are-thousands-of-years-older-than-we-knew

Using radiocarbon dating of four sites located in the Outer Hebrides (the Western Isles of Scotland), researchers have discovered ancient crannogs dating back to 3640–3360 BCE, meaning early humans were building these giant artificial islands roughly 5,500 years ago, pre-dating even the construction of Stonehenge.