To clarify, as i understand, the fusebox is ancient, it has no spare ways, it is also built into a small custom made cabinet in the middle of a room, with no spare space, in which used to be a garage. The tails would need uprating and it only has a 60 amp main fuse. To run a cable to a ev wall box, it would need to run along the skirting to outside as its a solid floors. Without a major revamp, and disruption, i just can’t see it happening.