You definitely want it in before the car arrives. The difference in cost between public and home charging is huge. If you’re lucky install can take a few weeks to get organised and done, if you’re less lucky it may take months. Then there’s that trick where Ohme decide they can’t install it or it’s a non-standard installation. Either way, I’d want to know before putting my pin in. I’d get it started now, it hurts nobody just sat there and, if there’s any issues you have time to get them sorted without any time pressure.
I think the installation will be one of the simplest they have had,the meter box has everything inplace,80amp fuse, its not looped,the fusebox is the other side of the door from the meter box (if they need to connect anything),all the earth straps are in place where they should be on water pipes gas pipe,they will only need about 1 mtr of cable to connect the Ohme to the power supply…………..Famous last words then computer says No…..Lol