Environmental charity Earth Trust shared a video of the remnants of a barbecue still smouldering and surrounded by litter and burnt wood at historic chalk beech mounds the Wittenham Clumps in South Oxfordshire. FILE PHOTO - fires lit in woodlands can easily turn to wildfires in dry conditions (Image: Oxfordshire Fire and Rescue Service)"It could spread into the hedgerows, damage the woodlands, and cause real, lasting harm to the archaeology of Castle Hill. READ MORE: Police taskforce 'first on scene' of crash which closed M40"Please do not bring BBQs or light fires at the Clumps or any of our nature reserves. "If you see vegetation on fire, no matter how small, call 999 immediately and ask for the fire service. People are asked to bring picnics instead, take all litter home, leave no trace on the landscape and report any signs of fire immediately to protect the iconic landscape.