OK so update from me.
Car went in for service end of November-ish. Spoke to Master tech and he had not heard of this problem but as he could not guarantee 100% that the parking heater would still work when the vehicle was unplugged, he did not install the software at the service. I took the car back with the old software version and he did some more digging into the subject.
Went back for it's MOT yesterday. Master Tech had done his digging and was confident that the latest software would not cause the problem described here. The latest software was installed at the MOT yesterday.
This morning I triggered the heating from the App via Google voice assistant. The car was not plugged in. It heated up fine.
All is well.
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Currently:-
MY16 XC90 T8 Momentum, Magic Blue 174k miles.
MY17 V60 T4 Power Blue.
Previously:-
1997 V70 T5 exPolice; 2005 V50 2.0D; 2013 XC70 D5
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