Matthew Hanley, who lives near the warehouse, said he could see the smoke from a mile away.
He told LondonlovesBusiness.com: “The warehouse itself is huge, it just recently had an expansion making it about 25% larger than it was when it was built. I live a couple of miles away from the warehouse itself and when I heard about it I thought I’d go and take my camera.
“Unbeknown to me the roads had been cut off at either end but because of where I live it was quicker walk over the nearby nature reserve and once I reached the top you could see the smoke rising from the place from about a mile away.
“It was quite shocking.”