It's an underground car park. Any fire will have more severe consequences and charging stations add to sabotage and fire risks however small. They will just have to relocate the charging posts to open air area.
Petrol cars catch fire more frequently than electric ones, according to your statistics, so why don't they ban them from the underground carparks, and wasn't it a "diesel" car that burnt down Luton Airport? The question is how big is the risk? The Parliamentary Fire and Safety teams have obviously decided that the risk to have EVs charging there is too high. Are they a bunch of wusses or do they know something?
BTW, did you know that each solid state battery that goes in an EV requires 1kg of silver in it? The way the silver and gold markets works for investment is that a lot of ownership is based on promisary notes. Nobody actually has the silver. I heard a few years ago that the actual amount of silver in existance for investment is 30 times over-subscribed compared with how much is owned. Some guys on Reddit calculated that if a million group members all ordered an ounce and had it actually delivered to their house, it would create a shortage, and the price would go up, so they'd make a profit. If what7 they said is true, what's going to happen to the price of silver, when millions of EVs have 1kg of actual silver in them, plus all the phones, laptops and everything else?
At the moment, about 26,000 tons of silver are mined annually, and about 80% of it is already used in industry. If 20% of all cars sold have the solid state batteries, they'd need 16,000 tons of silver.
Who's going to start buying silver while it's cheap?