Have a read of this sorry tale of woe... DIY EV Installation...
With smoke damage pictures... plus some very good 'experience' recommendations.
The fire started in a faulty isolator switch it seems. It would be great to think that qualified installation electricians would have been more likely to have found the potential fault (before the fault had even shown itself) but if they were anything like the guys that fitted my charge point I would have my doubts. They may well have just made sure their own work was sound just like the owner in this story. Subsequent to installation I had occasion to open up the mini consumer unit in our garage and witness the earth wire literally fall out of its connector! Fortunately our garage is far away from the house so if the worst came to the worst it would hopefully burn itself out without affecting anything else.