An air ambulance is at the scene of a crash on the M20 which has been partially closed this morning. Drivers heading coastbound are facing delays between J1 for Swanley and J3 for the M26 after it was shut following a serious multi-vehicle collision. All emergency services are in attendance. National Highways traffic officers are in attendance to assist with traffic management. Drivers are being diverted via the M25, A2, M2 to J4 of the M20. Motorists have been told by the traffic company to allow extra journey time and to plan ahead. More as we have it.