In other battery fire news, Gateshead Council is getting cross after a couple of fires in recycling centres, thought to be caused by mobile phone or laptop batteries.
https://www.gateshead.gov.uk/article/17896/Another-recycling-centre-fire-raises-battery-concerns
That happened to my dad's car. He dropped it off for its MOT and got a call from the garage a couple of hours later. Good news, and bad news...An ICE car catching fire next to your car will also wreck your car and they are between 10x and 80x more likely according to the studies I've seen.
More likely that what @Dadam
I shall hazard a guess that it wasn't the other car that caused the fire. The cause was the (unsafe) actions of those in the garage working on ill-fated car/fire source.That happened to my dad's car [it] passed [its MOT] without any work being needed [but] an hour later it was destroyed in a fire caused by another car!