My house is on a looped supply, Wasn’t an issue as the easee EV charger that was installed has options to decrease the load if needed.
My house wasn’t water or gas bonded and the installer did all this on the install day , I also had to take pictures like you’ve been asked for , I also couldn’t provide pictures of my bonding as it wasn’t done. They sent out a serveyer and who wrote down what was needed. We needed gas and earth bonding , and an extra 20ft of cabling has the fuse box is towards the back of my house.