These images show the moment the air ambulance arrived at a four-car crash on the M25 in St Albans this morning.

Emergency services were called to the slip road of J22 A1081/B556 (St Albans/The Bell Roundabout/London Colney) at 7.40am.

The cars involved including a black Audi A6, silver Nissan Kashqai, gold BMW 5 series and a white Toyota Starlet have now been recovered. The slip road is now open.