Firstly I would like to get 2 things out of the way, the product the charger works perfectly a solid 9 out of ten. The engineer who installed it 10 out of 10 working in the very cold snap but maintained social distancing and wore a mask. Now the company what a disgrace. Initially no advice on the process and what would be required, found from UK Power Networks the electrical installation at my property is split into 3 sections. Up to the main fuse is UK Power Networks, from there to the electric meter is your electrical suppliers and from there on is my responsibility and need to get my own electrician. BP could not give me the amp usage of the charger to determine what main fuse and cabling I needed, UK Power Network told me. Supplied the photos they required but beware there is a size limit to the supplied pictures but you don't know this until you try to submit them. Also had to submit photos several times, why I don't know. I had got so fed up by this point I just did what was asked. Not the easiest company to contact shortest wait time on the phone was 45 minutes when ringing at 08:00am, their opening time. This process took best part of 5 months from taking delivery of the car to having a charger. I will be contacting Mercedes to advise they change their recommended supplier.