So, by way of an update my T8 has spent a bit more than 4 weeks with the Volvo dealer. They have established that there is an intermittent excessive drain on the 12v battery. Much of the time the demand on the 12v battery will sit under an amp but quite frequently it will shoot up to 15 Amps. They have tried a range of methods to try to identify what is driving the increase to 15 Amps but without success yet.
The car has in effect been with them since the 5th Feb. I have borrowed the car from them on two weekends to drive long distances. In less than a day after significant use, the 12v battery will go flat. I carry an additional 12v battery and jump leads to get the electronics on and the car going again. Last weekend I drove 230 miles one day. When I came back to the car 16 hours later the 12V battery was flat again.
The dealer is stuck and now talking about involving Volvo themselves. If they establish the cause I'll post the outcome.
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