Jim appreciate the input
Untethered will look better than having a 7.5 m cable permantly hanging from the wall imo
Pulling the cable from the boot even if its weekly is quite easy for me to do plus I will be handling a clean dry cable
Although I can see and appreciate why a tethered set up may well benefit others
I was being conservative in my consumption estimates as the cars mileage will equates to just 15/18 miles of urban driving a day.
My tarriff is standard so will just keep the official 280 range ( realistic 200 avg ) topped up as and when