Police officers who sent out letters to 1,700 Audi car owners have traced a woman who witnessed a fatal smash on the M25 in Essex.

The woman, from Bedfordshire, came forward after receiving a letter from Essex Police asking drivers if they had seen the September 19 crash.

Police still need to find the driver of a bright yellow Metro car who was known to be at the scene.

A 34-year-old man from Dagenham has been arrested and released on bail pending further inquiries into the incident.

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