But, first, most folks seem to agree that it was a Range Rover because of the unofficial images. Second, again, the make and model will be public knowledge soon enough, perhaps prior to the final report, perhaps not. The arrest won't mean bupkis if the final report again states this was a vehicle fault. The "distraction" will be months old and perhaps settled one way or another by the time we hear what the actual cause of the fire was (to the extent that can be determined).
It's really an utterly silly conspiracy involving fire and police officials allegedly ordered to prop up the sales figures of an automobile brand. Frankly, it's unimaginative and dull, considering the fun we've had with kamikaze submarines and steel-eating nuclear waste.