Average Proportion of Genetic Ancestry during the Pre-Roman Iron Age in Britain
| Region | EEF (%) | WHG (%) | Yamnaya (%) |
|---|---|---|---|
| Southern Britain | 45.5 | 8.5 | 46.0 |
| Central Britain | 39.0 | 10.0 | 51.0 |
| Wales | 37.5 | 9.5 | 53.0 |
| Northern Britain | 36.0 | 12.0 | 52.0 |
Research has shown that in 3000 BCE, people in what is now Great Britain derived an average of 80 percent of their genetic ancestry from early European farmers (EEF) and the remaining 20 percent from western European hunter-gatherers (WHG). When the genetic influence of another group, the Yamnaya, rose substantially in Britain around 2450 BCE, the average proportion of ancestry from EEF in present-day England and Wales decreased, dropping to only 31 percent by 2100 BCE. Studying genetic data from the pre-Roman Iron Age (750–43 BCE) across regions of Britain, a researcher claims that a wave of people with relatively high proportions of EEF ancestry likely migrated into southern Britain between 2100 BCE and the pre-Roman Iron Age.