A section of the M25 was closed today amid fears of an 'explosion' from an industrial estate fire that was raging next to the motorway. The industrial estate in Colney Street houses 15 units, including OMA V Film Studios - which has produced shows such as Slow Horses and The Essex Serpent. Three ambulances, three ambulance office vehicles, the Hazardous Area Response Team, and two air ambulances also rushed to the area. Locals were urged to keep their doors and windows closed and were told to avoid the area. 'We are maintaining water supply to the site through combination of water carriers and the High Volume Pump (HVP) system.