Hello fellow Range Rover sufferers 😉

On my drive to work today, I encountered five transmission faults followed by reduced engine performance. I then read the codes using the GAP tool and got these three error messages.
Can anyone tell me what first steps I should take to identify the issue?
Best regards,
Stev

Click image to enlarge

First thing to check is battery voltage should be around 12.6 volts 30 min after switch off...  Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
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2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
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I just had it towed.
The starter works and the engine turns over, but it simply won’t start.
I’ve now connected it to the battery charger and will try starting it again this evening.

I'm beginning to suspect that the engine has caused the transmission error