Our live feed has now finished.
- The M25 was closed anti-clockwise this morning and in the early afternoon between junctions 19 and 18.
- An "incident" involving an overturned lorry caused the blockage. Three lanes were blocked by the lorry and two other vehicles crashed into the central reservation.
- Herts Police, traffic officers, and recovery were called to the scene.
- This live blog has now closed after delays had mostly cleared by 1.15pm.
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