M25 clockwise blocked due to lorry fire

M25 clockwise blocked, stationary traffic due to lorry fire before J4 A21 / A224 (Orpington), congestion to J3 M20 / A20 (Swanley Interchange).

All traffic us being held half a mile from J4 due to a lorry fire on the hard shoulder as there is too much smoke drifting across the carriageway. The fire brigade are on the scene.