Emergency services, including an air ambulance, have responded to a serious multi-vehicle accident on the M25, the UK's busiest motorway. The incident occurred between Junction 25, A10 Great Cambridge Road in Enfield, and Junction 24, A111 Stagg Hill in Potters Bar. Traffic is severely affected, with congestion reported to stretch back to Junction 26 at Waltham Abbey. National Highways East has confirmed that delays are approximately 60 minutes, with four miles of traffic build-up following the earlier closure of the motorway. As of the latest updates, the clockwise lanes of the M25 have reopened between Junction 23 and Junction 25. However, the anti-clockwise lanes remain closed between Junction 25 and Junction 23 due to the ongoing recovery efforts. Police have been seen at the scene, managing the situation following the collision. National Highways East has advised motorists that traffic is currently stopped on the anti-clockwise side of the motorway and urged drivers to allow for extra journey time. While initial reports suggested serious injuries, it has since been clarified that the injuries are not as severe as first feared. This is a developing story, and updates will follow as more information becomes available.