I agree it’s the only way to get a cable easily outside, going up and under the floorboards would be a nightmare for one cable.
Rememember helping someone on here will an equaly silly quote, telling them to have the charger on the house wall and buy 20m cable, even taking in a slight voltatage drop, there wouldn’t have been a massive difference in charging speeds – Ohme come back to them and said they wouldn’t fit the charger and the custer use a long cable!
Maybe highlight extortionate prices directly to Motability ceo and put your argument forward.