Archaeologists investigating a former clay pit in Suffolk say they may have found some of the earliest strong signs that humans were deliberately making fire in Britain. The evidence points to activity around 400,000 years ago, pushing back the timeline for firm proof of fire-making in the region.

The key clues come from a small patch of ancient ground that appears to have been heated again and again to temperatures above 700°C. Nearby, researchers found flint handaxes that had fractured under intense heat, suggesting the area was closely linked to repeated burning rather than a single natural event.

Two fragments of iron pyrite add to the case. Pyrite can produce sparks when struck, making it a plausible material for starting fires. In combination with the scorched soil and heat-damaged stone tools, the find suggests early humans at the site may have been controlling or creating fire on purpose.

If that interpretation holds up, the Suffolk discovery would mark a major shift in understanding when people in Britain were able to generate fire for themselves. The site offers a rare glimpse of how early humans may have used technology and local materials to manage heat in a much earlier period than previously confirmed.