Dr Adrian Gaylard (Jaguar Land Rover) and Dr Thomas Wolf (Porsche) have now got back to me about the relationship between pressures and flows on the rear part of the car, and base pressure. Adrian also linked to an interesting paper and reference text.
Professor Joe Katz previously also got back to me on this topic.
There's lots to think about, and Adrian and Thomas take significantly different approaches in their explanations. Adrian's explanation also reminds me of something that Rob Palin (Tesla) told me, and I need to look that up again.
I'll post something when I have thought about it some more.
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