My experience from when I had an EV charger installed last year.
Firstly I needed to get the existing normal meter changed for a smart meter. When the installer came they asked if I would like them to install an isolator in the meter cupboard because I had mentioned it was being installed for an EV charger, and when I said yes, they did and there was no charge.
I had established that the existing main fuse needed to be changed from a 60amp to a 100amp fuse, but that needed to be done separately to the smart meter install.
For the fuse upgrade the meter tails and consumer tails needed to be of the right size -
https://innovation.ukpowernetworks.co.u ... h-2021.pdfIt appeared the consumer tails were ok but the meter tails and fuse had to be changed, so I contacted my local DNO who came out and did it for free, changing the fuse and the meter tails.
For the EV charger, although there was a spare slot in the CU and it was on the opposite side of the wall from where the charger would be fitted, the installer declined to use it, instead splitting the supply in the meter cupboard and installing a new single slot CU inside the meter cupboard to feed the EV charger from there.
Their reasoning was twofold. They touch my CU and if anything goes wrong with it afterwards then the customer may blame them. If anything goes wrong with the high powered EV charger then flip the switch on that dedicated CU and the house isn’t impacted and can carry on as normal.
Although there was now an isolator, because everything was a bit tight in the meter cupboard to fit everything (yes there is theoretically a prohibition on installing anything in a meter cupboard other than the meter, there isn’t really) the EV charger installer needed to move the isolator slightly. So they just broke the seals and pulled the main fuse.
When all done and installed, they contacted the DNO to confirm the installation of an EV charger, and a while later someone came out and fitted new seals to the main fuse.