At this time nobody knows what the starter was, it could be anything from a gas explosion, to possibly an exploding household device, to a flat being a Meth Factory or a flat being a Bomb Making Factory.
I would bet money on what caused the spread of the inferno that engulfed an entire tower of 27 storeys in they say just 15 minutes and that's the exterior cladding that was a mixture of oil-based plastic and foam and it spread from top to bottom inside probably because of these softwood doors and non-fire resistant paint and could have been avoided if it wasn't for things being carried out on the cheap.
When we look at the photos we can see that the way the fire spread is Strange!
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why strange? please explain .?
Because normally the fire extends to the ground but as you can see in Lucy Hamilton photos the fire seemed more concentrated in one place. As for an explosion?
This below is a picture of an elderly man looking out of the window last night while the horror was unfolding, I wonder if he managed to escape, looking at the condition of the structure around him and that the glass in the window is also intact, it suggests that he was in one of the floors 1-4 the only floors that remained unaffected by the inferno.
Scenes From the West London High-Rise Fire
The below picture shows the cladding panels, a mixture of oil-based plastic which will be backed with foam and sheet metal. As I've commented before, it will be this type of cladding that caused the inferno to engulf the exterior of the building up to the roof in such a fast 15 minute period.
This is the actual Grenfell Tower building pre-horror inferno.
This below picture is the actual Grenfell Tower building as it was before they put the above cladding panels on, as you can see it's all concrete, the reason why they put the above cladding panels on buildings is mainly for aesthetic reasons to make the building seem more attractive.
The Grenfell Tower before and after.
The concrete on the left, had they have used concrete on the right, the whole exterior of the building wouldn't have engulfed into a complete inferno.
The Grenfell Tower now.