Car was serviced early Nov with C2 and latest BMS update.Are you sure you already have the “Buggy” software ?.
Did you have one of the bad BMS software patches applied to your car or the “Comfort 2” and when ?.
Your high consumption could be caused by other factors as well.
Consumption (2.4mpkWh) is high because it was mostly 70mph on the motorway with a bit of suburban 40-50mph too.
At that level it should be good for 100 miles as it was last year , not 80 (for 100% battery).
Will report back soon with how many kWh I manage to stick in from 9% SoC. All last year I was getting about 41kWh assuming 90% AC charger efficiency.