Traffic delays are only around 15 minutes with one mile of congestion.

One lane remains closed while highways teams deal with fuel spillage from the coach.

There are now delays of two hours as two lanes remain closed.

Two lanes remain closed following an earlier vehicle fire.

The agency said: "On the clockwise carriageway, speed restrictions remain in place to ensure the safety of drivers and those working on the opposite side of the road.

"On the anticlockwise carriageway, we are preparing to release traffic. Lanes 1 and 2 will remain closed, with the closure extending beyond the incident scene. Please allow us a little more time to complete our final safety checks before reopening Lanes 3 and 4.

"Once traffic is released, the time it takes for vehicles to begin moving will depend on your position within the queue, so some delays may continue while congestion clears.

"Beyond the incident, drivers should also expect the usual rush-hour traffic conditions."

National Highways: South-East said: "Traffic stopped on the M25 anticlockwise in Greater London between J9 Leatherhead and J8 Redhill due to a coach fire.

"Emergency services are working on scene.

"Current delays of 58 minutes on the approach, with 8 miles of congestion."