“Crews are working hard to prevent the fire spreading to other units. We are likely to be on scene for a number of hours.
“Firefighters have been on scene for four hours. We’ve brought in additional resources to assist efforts to contain the fire.”
The fire brigade was called at 11.28pm on Monday – crews from Northolt, Wembley, Southall, Ealing, Harrow and other fire stations have been called to the scene.