I've been reading this thread right from the beginning, even before Darat moved it to Conspiracy Theories, and what can I say but it has been a very slow motion car crash. The year, make, model and colour of the car were in the public domain from a very early stage, and the rest was just so much hand-waving.
The real denial that's going on relates to the frequency of ICE vehicle fires. These are really really common. So common that if you just enter into Google the number of a UK road, or even a county, and the words "vehicle fire", you'll be overwhelmed with results. Many of these are from small local newspapers needing something to fill their pages, and even so they usually incorporate a "local angle" in the story, like "local mum's lucky escape" or "bus route diverted on Tuesday". The reason is that these things are happening all the bloody time. Stats say 300 vehicles per DAY. So it's hard to make them news.
EV fires on the other hand, are uncommon. Stats vary, but it's something like 20 to 60 times less likely that an EV will go on fire than an ICE car. And such has been the catastrophising of conspiracy theorists like Vixen, that these are NEWS. And the public run away with the idea that EVs are a huge fire risk. Which they manifestly are not. It makes no sense at all to jump to the conclusion, when we hear about a fire caused by a vehicle, that this is an EV. But that's where we are, thanks to this skewed perspective.
It has been the case that EV fires got the reputation of being hard (or even impossible) to extinguish, but this is to a large extent a result of firefighters not being trained in the best way to approach these incidents. Indeed, of the "best way" still being under development, given that the technology is relatively new. Things are changing however, and firefighters are being trained to deal with these as chemical fires where depriving the fire of oxygen is not the way to go. There are a number of videos on YouTube demonstrating how to put out an EV fire, and it's not that scary.
There is good reason to believe that the advent of EVs will make vehicle fires a much smaller risk than previously. First, the actual number of incidents is demonstrably falling in countries where EV adoption is high, simply to reflect that "20 to 60 times less likely to catch fire" thing. Second, the fires usually develop more slowly than ICE fires, giving time for people to escape or be rescued. Third, the actual amount of energy in a car battery is vastly less than in a tank of petrol or (even more so) diesel. A huge benefit is the absence of these "running fires" of burning fuel that are referred to several times in the Luton report, and which rapidly set light to vehicles a fair distance from the vehicle whose fuel has escaped. But that doesn't suit the narrative.
There's also a lot of misconception about what exactly is involved in an EV fire. These can be divided into three broad categories. The commonest category, by a long way, doesn't involve the battery burning at all. The fire starts elsewhere, either outside the car (maybe it has been parked next to another car that caught fire, or it's in an integral garage in a house that caught fire) or inside the car but not involving the battery (someone dropped a cigarette end, or there was a fault in the 12v electrical system - as may have been the case in the Luton fire, with the diesel car). In the great majority of cases, the battery of the car doesn't catch fire at all. The car (or even the house) burns down around the battery, which remains intact. This seems to have been what happened in the Swedish incident. The EVs involved burned like cars, except (unlike ICE cars) their fuel source didn't contribute to the intensity of the fire. The batteries were still there, intact, in the ashes, at the end of it all. There is a video on YouTube of a guy checking out his ruined Tesla after it was involved in a house fire, and the remote control was still able to open the tailgate.
So of all these EV fires (20 to 60 times less frequent than ICE fires), in the majority the battery simply wasn't involved in the fire at all, and the fire was as a consequence much less destructive than a typical ICE fire.
The next category is EVs where the cause of the fire is not the HV battery, but nevertheless the HV battery does start to burn as a result. These are often the result of crashes, where the battery has been damaged in the crash. Nasty affairs, but for the reasons given above, usually less scary than similar ICE cars. (Indeed, there are also videos around of crashes between Teslas and ICE cars, where the Tesla is sitting there going "ouch" over a smashed wing, while the ICE car beside it is in flames.) Usually time for people to get clear, less stored energy to fuel the fire, and techniques of fire-fighting getting better all the time.
The smallest category of all in EV fires is the one where the HV battery itself is the source of the fire. It's very rare. Most of the cases are attributable to a known fault, the main example being the Jaguar iPace, which was subject to a recall because of this. Aside from these known recall-triggering faults, HV batteries going into spontaneous thermal runaway is really really rare. There is an Australian group keeping stats on all this and I was gobsmacked by how low the numbers were. And that the cars were (almost?) never on charge when it happened.
So it's all really good news going forward. Not only are car parks being made safer by the incorporation of sprinkler systems and so on, but the likelihood of destructive fires is getting less and less as a larger and larger percentage of the car fleet goes over to EVs. They're 20 to 60 times less likely to catch fire in the first place. They don't produce running fires of liquid fuel that spread (literally) like wildfire along gutters and through drains. And the slower development of the fires makes it much more likely that the firefighters will be able to control them before they engulf an entire car park.
But this doesn't make the anti-EV conspiracy theorists happy, for some peculiar reason.