Watch Sally Simmonds full report below:
It is no longer considered to be a major incident, although fire crews remain at the scene on Thursday.
This footage from Hampshire Fire & Rescue shows the aftermath of the fire:
Residents are beginning to return to their homes and businesses are beginning to operate as normal.
Roads around the site are now open.
Crews from Hampshire Fire and Rescue worked throughout Wednesday night to remove toxic chemicals from the site.
Fire crews are expected to remain on site for the next few days.
It is thanks to the efforts of all our teams, on the ground and elsewhere, that we managed to contain the incident when it unexpectedly escalated late yesterday afternoon."
During the evacuation, Ocado vans with food, drink, nappies and other essentials were sent to Andover.
Hotel rooms were made available for those who had to leave their homes overnight.
The company has thanked the 'large number' of local businesses that helped the community and the emergency services and agencies for their 'professionalism' during the incident.
It has also thanked the people of Andover for their 'understanding and support' during this 'difficult period'.
The building and its contents has suffered substantial damage.
Ocado says it is working hard to minimise disruption for customers by increasing capacity at other facilities.
Southern Water supplied more than 2 million gallons of water to help tackle the blaze.
I would like to say a massive thank you to our emergency services colleagues and all those involved in responding to the Ocado fire at Walworth Business Park.