We paid just over £200 for the mains fuse upgrade to 100A. We paid just under £100 for ALL tails to be upgraded. We had new smart meters put in (which have stopped working) and a isolator switch, which we tipped about £20 to the guys doing it. We also paid about £15 in new cabling because the guys who came to install the charger had drilled through a light switch cable, and I had to dash out and buy some replacement cable.
A hell of a lot of time chasing BP throughout the process, which probably ‘cost’ more in time that the aforementioned costs lol..