Let's disregard the politics and the lobbying and look at the bare objective scientific facts.
Bwahaha! Do you think anyone in this forum accepts you as an expert on anything scientific? You haven't demonstrated even the competence we could expect from a typical lay person. Why should your analysis be given the time of day.
We have a precedent in the Liverpool ECHO Arena Fire of 31 Dec 2017. We have the Fire Brigade Report into that matter. This gives us a point of comparison.
Possibly, but you don't know what important elements are the same and which differ, and what their significance is.
To understand why the Luton car park collapsed as a consequence of fire, we need only look at the Luton car park. But that analysis has to be done according to a whole lot of expert understanding and fact that most people (especially you) simply don't have. And it's so important that such analysis be based on a foundation of appropriate knowledge and understanding that those tasked with determining the cause and making recommendations for the future must be specially licensed according to rigorous standards.
Since you don't have the expertise to perform the analysis the right way, you're doing it the typical conspiracy theorist way: you've selected something you think should be reasonably comparable and you're trying to show that if something differs from that, it should be considered suspicious.
In case you want to look them up, your approach commits the fallacy of begging the question (i.e., that some other occurrence must be considered exemplary or similar) and the fallacy of hasty generalization (i.e., the inability to discern whether a detail is an outlier).
On the other hand, Luton had no sprinklers as was recommended and was made of uncoated steel that become ductible...
The word you don't know is "ductile."
No. No amount of amateur handwaving makes you a scientist. Armchair detectives are worse than useless. You promised us you were only looking at the "bare objective scientific facts" and you've finished up—once again—by trying to foist your uninformed judgment.
This is why it is not possible at this stage to 'confirm' that the fire was definitely caused by a diesel-only powered car because it doesn't explain the super rapid spread and intensity of heat that kept the fire brigade external to the building.
No. As has been pointed out, you're confusing the identification of what kind of car first caught fire with what caused the fire.