Two motorcyclists are seriously injured after colliding on the M25 in Surrey. Reports say the crash involves two riders aged in their 30s and 40s, both travelling by motorcycle, and occurs on the junction 12 slip road at Chertsey. The collision reportedly takes place at about 5.45pm on Saturday. Following the crash, both men receive emergency treatment at the scene and are taken to hospital. One outlet reports that the riders are airlifted to hospital with critical injuries, indicating their condition is life-threatening. The incident prompts an emergency response and disrupts normal traffic in the area while responders deal with the scene. Details of the exact circumstances of the collision are not specified in the provided accounts, and no information is given on whether any other vehicles are involved or on the cause of the crash. Authorities continue to manage the incident and assess what happened.