Great research, guys, and thank you for taking us right to the scene of the crime (well, one of them)!
When you look at that steep stairway, and think how hard-to-manoeuvre a dead body must be, you can start to see how someone might get to the point of transporting one all the way from London to Devon, but then just kind of give up and leave it in the first vaguely concealed spot they came to. I feel tired just looking at it.
You've got to think that the body would have been moved downhill not uphill for choice, so that makes me wonder if it's Devon Road that was known to the accused, not Bennett Road, since Devon Road is presumably the one that was driven along before the corpse was then removed from the vehicle.
I'm presuming - but maybe someone can confirm - that they've had cadaver dogs all over that land between Devon Road and Bennett Road? Because I think you'd want to be sure that the head isn't there too somewhere. That's actually quite a lot of land, some of it apparently public and much of it basically people's gardens, and also a lot of it too steep to be very easily accessible.
Given the number of crime scenes and the fact that the court reporting seems to be saying she was killed in London and transported post mortem, it's possible, though, that the head never made it to Devon.
I know I seem obsessed with the head and I probably am! I'm just deeply curious to know if removing it was about making identification or establishing CoD difficult, or if it had personal or ritual significance, and I feel if only it could be found that might become clearer.
JMO