It wasn’t just a change in priorities. It turns out it was a wholesale take-over by a European group known as the 'Beaker People', leaving only about 10% of the original British population alive.
Graeme speaks with one of the archeologists behind the study, Professor Ian Armit about the people that built Stonehenge.
In 2,400 BC, any colonization at the time was coming by Sea to Britain, they were cut off by land.
Why are they called Beaker People? Professor Armit explains it's a cultural phenomenon.
There's nothing there that would suggest this is a period of major violence.
Listen to the full audio with Professor Ian Armit above.
Weekend Variety Wireless with Graeme Hill, 8pm - midnight Saturdays and Sundays, on RadioLIVE and streaming live to the Rova app on Android and iPhone.