Update....
My conclusion is that over the last 12 months the car has not had any good, long runs and the car needs these to charge properly.
So, COVID has damaged my Plus 8.....
FWIW I think it's your short daily trips to the livery yard with the bail onboard that's doing it - you will have to make sure you turn it into a 20 mile round trip
You could always put them in the back of the Sprinter
if you don't fancy that.
Over time the battery is slowly but surely being discharged without proper replenishment, I've seen this happen before.
